Missing Number - 2025

1. Probe description

The Missing Number probe assesses students’ number sequence understanding through two test types:

  • Missing Number Ascending (MNA): Students identify whether a sequence of numbers is in ascending order (tick ✓ or cross ✗)
  • Missing Number Choice (MNC): Students select the correct missing number from multiple options

In 2025 there are four forms used in the screening:

  • MNA0-20 (Foundation B) and MNC0-20 (Foundation A)
  • MNA0-100 (Year 1A) and MNC0-100 (Year 1B)

All forms are administered at BOY (Term 1), MOY (Term 3), and EOY (Term 4).

Note

This report excludes ABR alternate forms (is_abr == TRUE).

Download Foundation student data (wide format)

Download Year 1 student data (wide format)

2. Overview of test results

Term Test name Test ID Students Median items attempted Median accuracy (%)* Median correct / min
1 Missing Number Ascending 0-20 MNA0-20_2025 1172 6/30 83.3 5.66
3 Missing Number Ascending 0-20 MNA0-20_2025 647 8/30 90.0 8.40
4 Missing Number Ascending 0-20 MNA0-20_2025 514 9/30 90.0 9.41
1 Missing Number Choice 0-20 MNC0-20_2025 1245 5/30 83.3 4.29
3 Missing Number Choice 0-20 MNC0-20_2025 771 7/30 100.0 6.67
4 Missing Number Choice 0-20 MNC0-20_2025 559 8/30 100.0 8.33
1 Missing Number Ascending 0-100 MNA0-100_2025 1308 7/40 91.7 7.35
3 Missing Number Ascending 0-100 MNA0-100_2025 861 9/40 100.0 9.23
4 Missing Number Ascending 0-100 MNA0-100_2025 584 9/40 93.3 10.00
1 Missing Number Choice 0-100 MNC0-100_2025 1102 7/30 100.0 7.64
3 Missing Number Choice 0-100 MNC0-100_2025 630 8/30 100.0 9.18
4 Missing Number Choice 0-100 MNC0-100_2025 483 10/30 100.0 10.91
* Accuracy is calculated after removing non-attempted items.

3. Accuracy distribution

4. Response time distribution

5. Fluency distribution

Fluency distribution

Term Students 25th percentile Median 75th percentile
Term 1 1172 3.40 5.66 8.18
Term 3 647 6.32 8.40 10.59
Term 4 514 7.50 9.41 11.78

Bottom quartile vs rest

Term Group Students 25th percentile Median 75th percentile
Term 1 Bottom 25% 300 1.22 2.18 3.05
Term 1 Rest 872 5.26 6.79 8.78
Term 3 Bottom 25% 163 3.21 4.36 5.56
Term 3 Rest 484 7.92 9.23 11.32
Term 4 Bottom 25% 130 4.55 6.00 6.81
Term 4 Rest 384 9.06 10.38 12.74

Fluency distribution

Term Students 25th percentile Median 75th percentile
Term 1 1245 2.18 4.29 7.20
Term 3 771 4.36 6.67 9.41
Term 4 559 5.51 8.33 10.63

Bottom quartile vs rest

Term Group Students 25th percentile Median 75th percentile
Term 1 Bottom 25% 314 1.00 1.15 2.03
Term 1 Rest 931 3.75 5.56 8.00
Term 3 Bottom 25% 200 1.37 2.58 3.48
Term 3 Rest 571 6.23 8.18 10.21
Term 4 Bottom 25% 140 2.68 4.20 4.87
Term 4 Rest 419 7.57 9.41 11.32

Fluency distribution

Term Students 25th percentile Median 75th percentile
Term 1 1308 5.36 7.35 9.77
Term 3 861 6.92 9.23 11.54
Term 4 584 7.78 10.00 12.45

Bottom quartile vs rest

Term Group Students 25th percentile Median 75th percentile
Term 1 Bottom 25% 336 3.16 4.20 4.71
Term 1 Rest 972 6.79 8.57 10.38
Term 3 Bottom 25% 219 4.29 5.45 6.32
Term 3 Rest 642 8.89 10.19 12.24
Term 4 Bottom 25% 155 5.26 6.43 7.35
Term 4 Rest 429 9.55 11.11 13.58

Fluency distribution

Term Students 25th percentile Median 75th percentile
Term 1 1102 4.80 7.64 10.53
Term 3 630 6.27 9.18 12.45
Term 4 483 8.08 10.91 13.80

Bottom quartile vs rest

Term Group Students 25th percentile Median 75th percentile
Term 1 Bottom 25% 278 2.40 3.33 4.17
Term 1 Rest 824 6.82 8.89 11.25
Term 3 Bottom 25% 158 2.95 4.21 5.17
Term 3 Rest 472 8.57 10.78 13.33
Term 4 Bottom 25% 122 4.92 6.32 7.20
Term 4 Rest 361 10.38 12.22 15.00

6. MNC Distractor selection

This section shows which answer students selected for Missing Number Choice (MNC) tests.

Tip💡 Tip

Click on any plot to view an enlarged version in a lightbox popup.

7. Item statistics

Question type
Correct RT (sec)
Q# Question Error type Error pos. Cross dec. N resp. % Correct Med. RT 95th RT Item disc.
Term 1
1 9 10 11 12 — — — 1138 78.8 10.0 32.00 0.11
2 7 8 9 10 — — — 1072 82.7 7.0 20.70 0.07
3 15 17 18 19 a B n 1001 71.0 7.0 19.00 0.10
4 13 14 14 15 b M n 902 81.4 7.0 16.00 0.09
5 0 1 2 3 — — — 820 91.2 5.0 11.00 0.04
6 8 9 11 12 c M y 674 77.4 6.0 14.00 0.17
7 13 14 15 16 — — — 525 82.1 5.0 11.00 0.12
8 10 9 10 11 d B y 411 84.2 5.0 10.00 0.18
9 17 81 19 20 e B n 283 34.6 4.0 10.00 0.04
10 12 13 14 15 — — — 200 69.5 4.0 9.00 -0.18
11 0 1 2 3 — — — 154 84.4 3.0 8.00 0.20
12 11 12 13 41 e E n 115 53.9 2.0 7.00 0.24
13 16 17 18 17 d E n 91 49.5 2.0 6.40 0.23
14 9 11 12 13 c M y 72 61.1 2.0 5.00 0.34
15 16 17 18 19 — — — 54 70.4 2.0 5.00 -0.01
16 5 6 7 8 — — — 52 59.6 2.0 5.00 0.12
17 11 11 12 13 b B n 44 50.0 2.0 4.95 0.30
18 16 17 18 19 — — — 29 58.6 2.0 4.20 -0.12
19 11 12 13 14 — — — 25 64.0 1.5 3.00 0.33
20 12 13 15 16 a M n 21 57.1 1.0 2.00 0.63
21 14 15 16 17 — — — 19 84.2 2.0 5.25 NA
22 13 14 16 17 a M n 13 76.9 1.0 2.00 NA
23 0 1 2 3 — — — 11 81.8 1.0 2.60 NA
24 9 10 11 12 — — — 8 50.0 2.0 2.00 NA
25 16 17 81 19 e E n 8 37.5 1.0 1.90 NA
26 9 8 7 8 d E n 6 33.3 1.5 1.95 NA
27 15 16 17 18 — — — 3 33.3 1.0 1.00 NA
28 5 6 7 7 b E n 3 66.7 1.0 1.00 NA
29 17 18 19 20 — — — 2 50.0 2.0 2.00 NA
30 8 9 11 12 c M y 2 50.0 1.0 1.00 NA
Term 3
1 9 10 11 12 — — — 630 91.4 8.0 21.00 0.20
2 7 8 9 10 — — — 595 92.9 5.0 14.00 0.20
3 15 17 18 19 a B n 598 81.4 6.0 16.70 0.23
4 13 14 14 15 b M n 582 90.4 5.0 12.75 0.10
5 0 1 2 3 — — — 561 95.5 5.0 10.00 0.06
6 8 9 11 12 c M y 524 87.2 5.0 11.00 0.10
7 13 14 15 16 — — — 471 93.8 5.0 11.00 0.09
8 10 9 10 11 d B y 406 91.9 4.0 9.00 0.09
9 17 81 19 20 e B n 307 34.5 5.0 13.00 0.29
10 12 13 14 15 — — — 228 89.9 4.0 8.00 0.01
11 0 1 2 3 — — — 178 93.8 3.0 7.00 0.06
12 11 12 13 41 e E n 100 47.0 3.0 7.00 0.26
13 16 17 18 17 d E n 68 61.8 4.0 7.00 0.21
14 9 11 12 13 c M y 44 68.2 3.0 10.30 0.46
15 16 17 18 19 — — — 26 76.9 2.5 8.30 -0.22
16 5 6 7 8 — — — 21 95.2 2.0 5.00 -0.01
17 11 11 12 13 b B n 16 93.8 2.0 3.30 NA
18 16 17 18 19 — — — 12 66.7 2.0 3.30 NA
19 11 12 13 14 — — — 10 90.0 2.0 3.60 NA
20 12 13 15 16 a M n 5 60.0 2.0 2.00 NA
21 14 15 16 17 — — — 5 60.0 2.0 2.90 NA
22 13 14 16 17 a M n 5 60.0 2.0 4.70 NA
23 0 1 2 3 — — — 4 75.0 2.0 2.00 NA
24 9 10 11 12 — — — 3 66.7 1.5 1.95 NA
25 16 17 81 19 e E n 2 100.0 1.0 1.00 NA
26 9 8 7 8 d E n 2 50.0 1.0 1.00 NA
27 15 16 17 18 — — — 1 0.0 NA NA NA
28 5 6 7 7 b E n 1 100.0 1.0 1.00 NA
29 17 18 19 20 — — — 1 0.0 NA NA NA
30 8 9 11 12 c M y 1 100.0 1.0 1.00 NA
Term 4
1 9 10 11 12 — — — 504 93.5 6.0 17.50 0.11
2 7 8 9 10 — — — 483 93.6 4.5 12.45 0.17
3 15 17 18 19 a B n 487 83.8 5.0 14.00 0.06
4 13 14 14 15 b M n 478 92.5 4.0 10.00 0.10
5 0 1 2 3 — — — 473 96.8 4.0 10.00 0.00
6 8 9 11 12 c M y 453 87.9 5.0 10.15 0.14
7 13 14 15 16 — — — 427 93.0 5.0 10.20 0.02
8 10 9 10 11 d B y 388 95.4 4.0 9.00 0.05
9 17 81 19 20 e B n 311 42.1 6.0 13.00 0.13
10 12 13 14 15 — — — 240 87.9 4.0 8.00 0.10
11 0 1 2 3 — — — 191 93.7 3.0 5.10 0.13
12 11 12 13 41 e E n 132 72.7 4.0 8.00 0.28
13 16 17 18 17 d E n 96 65.6 4.0 7.00 0.25
14 9 11 12 13 c M y 68 75.0 3.0 5.00 0.28
15 16 17 18 19 — — — 44 88.6 3.0 4.10 0.21
16 5 6 7 8 — — — 31 77.4 2.0 5.00 0.21
17 11 11 12 13 b B n 27 81.5 2.0 4.00 0.27
18 16 17 18 19 — — — 18 77.8 2.0 4.70 NA
19 11 12 13 14 — — — 15 80.0 2.0 3.00 NA
20 12 13 15 16 a M n 14 57.1 1.5 3.65 NA
21 14 15 16 17 — — — 9 77.8 2.0 3.00 NA
22 13 14 16 17 a M n 9 66.7 1.5 3.50 NA
23 0 1 2 3 — — — 6 66.7 1.5 4.55 NA
24 9 10 11 12 — — — 5 40.0 2.0 2.90 NA
25 16 17 81 19 e E n 5 60.0 1.0 1.90 NA
26 9 8 7 8 d E n 7 85.7 1.0 3.25 NA
27 15 16 17 18 — — — 4 75.0 2.0 2.90 NA
28 5 6 7 7 b E n 2 50.0 1.0 1.00 NA
29 17 18 19 20 — — — 2 0.0 NA NA NA
30 8 9 11 12 c M y 2 50.0 1.0 1.00 NA

Question type labels

Label Description
Error Type
a skipped number
b repeated number
c skipped decade number
d inconsistent order (ascending/descending)
e reversed digits
Error Position
B first digit
E last digit
M middle digits
Cross Decade
n erroneous sequence within decade
y erroneous sequence crossing decade
Question type
Correct RT (sec)
Q# Question Range Cross dec. N resp. % Correct Med. RT 95th RT Item disc.
Term 1
1 _14 15 H N 1183 63.4 12.0 39.55 0.37
2 6 7 _ L N 1127 80.7 8.0 21.00 0.25
3 12 13 _ H N 1017 73.5 7.0 18.65 0.36
4 9 _ 11 L Y 926 73.5 6.0 14.00 0.39
5 17 _ 19 H N 739 67.8 7.0 17.00 0.43
6 2 _ 4 L N 617 80.9 6.0 13.10 0.42
7 16 17 _ H N 476 69.1 5.0 11.60 0.53
8 _ 7 8 L N 344 74.4 5.0 10.00 0.52
9 12 _ 14 H N 252 59.5 5.0 9.00 0.59
10 14 _ 16 H N 177 46.3 5.0 10.00 0.76
11 16 17 _ H N 120 50.0 3.0 7.00 0.58
12 _ 18 19 H N 96 55.2 3.0 6.80 0.46
13 4 _ 6 L N 73 43.8 3.0 6.45 0.51
14 1 2 _ L N 62 33.9 3.0 4.00 0.50
15 11 12 _ H N 49 51.0 2.0 5.00 0.38
16 _ 14 15 H N 36 36.1 3.0 4.80 0.43
17 _ 6 7 L N 31 41.9 2.0 3.80 0.06
18 10 _ 12 H Y 28 21.4 1.0 2.75 0.60
19 _ 1 2 L N 22 50.0 1.0 7.50 -0.03
20 16 _ 18 H N 18 5.6 2.0 2.00 NA
21 4 5 _ L N 15 33.3 2.0 3.80 NA
22 3 _ 5 L N 12 58.3 1.0 2.00 NA
23 _ 16 17 H N 7 0.0 NA NA NA
24 8 9 _ L Y 5 20.0 2.0 2.00 NA
25 _ 15 16 H N 3 66.7 1.0 1.00 NA
26 _ 11 12 H Y 2 0.0 NA NA NA
27 4 5 _ L N 3 0.0 NA NA NA
28 7 8 _ L N 2 0.0 NA NA NA
29 _ 5 6 L N 2 100.0 2.0 2.00 NA
30 5 _ 7 L N 1 100.0 1.0 1.00 NA
Term 3
1 _14 15 H N 744 82.7 10.0 32.00 0.38
2 6 7 _ L N 711 88.5 6.0 18.00 0.26
3 12 13 _ H N 691 87.7 6.0 16.00 0.34
4 9 _ 11 L Y 657 85.1 6.0 14.00 0.36
5 17 _ 19 H N 559 85.0 7.0 16.30 0.41
6 2 _ 4 L N 491 91.4 5.0 11.00 0.35
7 16 17 _ H N 424 83.5 5.0 11.00 0.50
8 _ 7 8 L N 332 89.8 5.0 12.00 0.48
9 12 _ 14 H N 236 78.4 5.0 11.00 0.64
10 14 _ 16 H N 160 73.8 5.0 11.15 0.74
11 16 17 _ H N 109 75.2 3.0 6.00 0.72
12 _ 18 19 H N 77 71.4 4.0 8.00 0.54
13 4 _ 6 L N 53 60.4 3.5 7.00 0.80
14 1 2 _ L N 34 67.6 4.0 8.80 0.54
15 11 12 _ H N 23 73.9 2.0 5.00 0.54
16 _ 14 15 H N 18 33.3 2.0 22.25 NA
17 _ 6 7 L N 16 43.8 4.0 10.20 NA
18 10 _ 12 H Y 11 81.8 2.0 5.20 NA
19 _ 1 2 L N 7 57.1 1.5 2.00 NA
20 16 _ 18 H N 4 0.0 NA NA NA
21 4 5 _ L N 3 33.3 2.0 2.00 NA
22 3 _ 5 L N 1 0.0 NA NA NA
23 _ 16 17 H N 1 0.0 NA NA NA
24 8 9 _ L Y 2 50.0 3.0 3.00 NA
25 _ 15 16 H N 1 100.0 1.0 1.00 NA
26 _ 11 12 H Y 2 0.0 NA NA NA
27 4 5 _ L N 1 0.0 NA NA NA
28 7 8 _ L N 1 0.0 NA NA NA
Term 4
1 _14 15 H N 545 87.5 8.0 26.00 0.34
2 6 7 _ L N 544 94.5 5.0 18.00 0.24
3 12 13 _ H N 518 90.9 5.0 14.00 0.32
4 9 _ 11 L Y 519 91.5 5.0 13.30 0.25
5 17 _ 19 H N 463 88.8 6.0 15.00 0.34
6 2 _ 4 L N 426 93.0 5.0 12.00 0.32
7 16 17 _ H N 374 91.2 5.0 11.00 0.37
8 _ 7 8 L N 309 92.2 5.0 10.00 0.43
9 12 _ 14 H N 229 87.3 5.0 11.00 0.58
10 14 _ 16 H N 162 79.6 4.0 8.00 0.60
11 16 17 _ H N 118 83.9 3.0 7.00 0.52
12 _ 18 19 H N 86 79.1 4.0 7.65 0.60
13 4 _ 6 L N 52 71.2 3.0 6.20 0.71
14 1 2 _ L N 40 70.0 3.0 5.00 0.71
15 11 12 _ H N 28 67.9 3.0 4.00 0.61
16 _ 14 15 H N 16 50.0 3.0 6.00 NA
17 _ 6 7 L N 12 41.7 2.0 3.80 NA
18 10 _ 12 H Y 11 36.4 3.0 4.85 NA
19 _ 1 2 L N 9 55.6 2.0 5.40 NA
20 16 _ 18 H N 7 57.1 3.0 4.85 NA
21 4 5 _ L N 6 50.0 2.0 2.90 NA
22 3 _ 5 L N 4 25.0 2.0 2.00 NA
23 _ 16 17 H N 4 25.0 1.0 1.00 NA
24 8 9 _ L Y 3 0.0 NA NA NA
25 _ 15 16 H N 2 50.0 4.0 4.00 NA
26 _ 11 12 H Y 2 50.0 1.0 1.00 NA
27 4 5 _ L N 2 50.0 3.0 3.00 NA
28 7 8 _ L N 2 0.0 NA NA NA
29 _ 5 6 L N 1 100.0 5.0 5.00 NA
30 5 _ 7 L N 1 100.0 4.0 4.00 NA

Question type labels

Label Description
Range
H starting number 10 or more
L starting number less than 10
Cross Decade
N sequence does not include a decade number
Y sequence includes a decade number
Question type
Correct RT (sec)
Q# Question Error type Error pos. Range Cross dec. N resp. % Correct Med. RT 95th RT Item disc.
Term 1
1 32 33 35 36 a M L n 1291 81.7 9.0 25.30 0.07
2 17 18 18 19 b M L n 1253 88.7 5.0 13.00 0.06
3 47 48 49 50 — — M — 1217 87.2 7.0 16.00 0.15
4 7 8 9 10 — — L — 1206 96.8 5.0 10.00 0.07
5 78 79 81 82 c M H y 1102 78.4 8.0 16.00 0.00
6 84 85 86 87 — — H — 940 89.6 6.0 13.00 0.19
7 26 27 28 29 — — L — 789 92.0 5.0 10.00 0.10
8 92 93 94 95 — — H — 621 93.2 5.0 9.00 0.18
9 29 28 29 30 d M L n 457 72.4 5.0 9.00 0.09
10 64 65 66 67 — — M — 319 89.3 4.0 8.00 0.33
11 73 74 57 76 e E H n 226 75.2 4.0 8.55 0.24
12 50 51 52 53 — — M — 158 86.1 3.0 5.00 0.27
13 33 34 35 36 — — L — 110 83.6 3.0 6.00 0.23
14 22 23 24 52 e E L n 77 70.1 3.0 6.00 0.36
15 9 10 11 10 d E L y 51 62.7 3.0 5.45 0.14
16 67 68 69 70 — — H — 32 59.4 3.0 5.10 0.46
17 57 58 59 61 c E M y 27 51.9 3.0 4.00 0.58
18 15 16 17 18 — — L — 19 42.1 2.0 2.65 NA
19 7 8 8 9 b M L n 17 58.8 1.5 5.10 NA
20 53 54 55 56 — — M — 14 35.7 1.0 3.60 NA
21 81 82 83 84 — — L — 11 54.5 1.5 2.00 NA
22 90 92 93 94 a B H n 7 28.6 1.5 1.95 NA
23 45 46 74 48 e E M n 8 37.5 3.0 3.00 NA
24 25 26 26 27 b M L n 6 33.3 1.0 1.00 NA
25 31 32 33 34 — — L — 5 40.0 1.5 1.95 NA
26 100 97 98 99 d B H y 4 75.0 1.0 10.00 NA
27 79 80 81 82 — — H — 2 0.0 NA NA NA
28 49 51 52 53 c B M y 1 100.0 1.0 1.00 NA
29 14 15 61 17 e M L n 1 100.0 1.0 1.00 NA
Term 3
1 32 33 35 36 a M L n 850 83.2 7.0 20.00 0.06
2 17 18 18 19 b M L n 837 92.7 4.0 10.00 -0.05
3 47 48 49 50 — — M — 818 91.7 6.0 12.00 0.14
4 7 8 9 10 — — L — 817 97.6 4.0 9.00 0.02
5 78 79 81 82 c M H y 784 80.1 6.0 13.00 0.02
6 84 85 86 87 — — H — 731 92.6 6.0 11.00 0.07
7 26 27 28 29 — — L — 659 95.0 5.0 10.00 0.02
8 92 93 94 95 — — H — 578 96.4 5.0 8.00 0.09
9 29 28 29 30 d M L n 460 81.1 5.0 9.00 0.02
10 64 65 66 67 — — M — 367 92.4 4.0 9.00 0.11
11 73 74 57 76 e E H n 240 81.2 4.0 8.00 0.23
12 50 51 52 53 — — M — 171 90.1 3.0 6.00 0.18
13 33 34 35 36 — — L — 131 92.4 3.0 7.00 0.01
14 22 23 24 52 e E L n 83 69.9 3.0 5.15 0.34
15 9 10 11 10 d E L y 66 66.7 3.0 5.85 0.31
16 67 68 69 70 — — H — 45 86.7 3.0 5.10 0.24
17 57 58 59 61 c E M y 30 50.0 3.0 5.30 0.41
18 15 16 17 18 — — L — 19 78.9 2.0 4.30 NA
19 7 8 8 9 b M L n 18 44.4 2.0 3.00 NA
20 53 54 55 56 — — M — 14 64.3 2.0 5.20 NA
21 81 82 83 84 — — L — 10 50.0 2.0 4.00 NA
22 90 92 93 94 a B H n 9 66.7 1.0 2.75 NA
23 45 46 74 48 e E M n 7 85.7 2.5 4.75 NA
24 25 26 26 27 b M L n 8 50.0 2.0 3.00 NA
25 31 32 33 34 — — L — 4 0.0 NA NA NA
26 100 97 98 99 d B H y 4 50.0 1.0 1.00 NA
27 79 80 81 82 — — H — 3 33.3 1.0 1.00 NA
28 49 51 52 53 c B M y 3 33.3 1.0 1.00 NA
29 14 15 61 17 e M L n 2 50.0 0.0 0.00 NA
30 26 27 28 29 — — L — 2 50.0 1.0 1.00 NA
31 74 75 76 77 — — H — 2 100.0 1.5 1.95 NA
32 16 17 18 19 — — L — 2 100.0 1.0 1.00 NA
33 39 41 42 43 c B M y 1 0.0 NA NA NA
Term 4
1 32 33 35 36 a M L n 581 83.3 6.0 14.00 0.09
2 17 18 18 19 b M L n 562 91.3 3.0 8.40 0.14
3 47 48 49 50 — — M — 564 93.8 5.0 12.60 0.05
4 7 8 9 10 — — L — 556 96.9 4.0 9.00 -0.03
5 78 79 81 82 c M H y 550 81.5 6.0 12.00 0.16
6 84 85 86 87 — — H — 531 94.9 5.0 12.00 0.01
7 26 27 28 29 — — L — 488 95.5 5.0 10.00 -0.01
8 92 93 94 95 — — H — 448 94.0 4.0 9.00 0.00
9 29 28 29 30 d M L n 372 79.8 5.0 10.00 0.12
10 64 65 66 67 — — M — 304 93.8 5.0 9.00 0.03
11 73 74 57 76 e E H n 212 80.2 4.0 8.00 0.30
12 50 51 52 53 — — M — 156 94.2 3.0 6.00 -0.08
13 33 34 35 36 — — L — 116 88.8 3.0 6.00 0.18
14 22 23 24 52 e E L n 72 81.9 3.0 5.00 0.36
15 9 10 11 10 d E L y 46 80.4 3.0 5.00 0.28
16 67 68 69 70 — — H — 31 77.4 2.5 5.70 0.25
17 57 58 59 61 c E M y 16 56.2 2.0 3.60 NA
18 15 16 17 18 — — L — 10 50.0 2.0 2.80 NA
19 7 8 8 9 b M L n 11 72.7 2.0 2.65 NA
20 53 54 55 56 — — M — 10 80.0 2.0 3.65 NA
21 81 82 83 84 — — L — 8 75.0 1.5 2.75 NA
22 90 92 93 94 a B H n 7 28.6 2.0 2.00 NA
23 45 46 74 48 e E M n 7 42.9 4.0 4.00 NA
24 25 26 26 27 b M L n 3 33.3 3.0 3.00 NA
25 31 32 33 34 — — L — 5 60.0 1.0 1.00 NA
26 100 97 98 99 d B H y 4 50.0 2.5 2.95 NA
27 79 80 81 82 — — H — 2 0.0 NA NA NA
28 49 51 52 53 c B M y 2 50.0 1.0 1.00 NA
29 14 15 61 17 e M L n 2 100.0 1.0 1.00 NA
30 26 27 28 29 — — L — 1 0.0 NA NA NA
32 16 17 18 19 — — L — 1 0.0 NA NA NA
33 39 41 42 43 c B M y 1 100.0 1.0 1.00 NA

Question type labels

Label Description
Error Type
a skipped number
b repeated number
c skipped decade number
d inconsistent order (ascending/descending)
e reversed digits
Error Position
B first digit
E last digit
M middle digits
Range
H 60-100
M 40-59
L 0-39
Cross Decade
n erroneous sequence within decade
y erroneous sequence crossing decade
Question type
Correct RT (sec)
Q# Question Range Cross dec. N resp. % Correct Med. RT 95th RT Item disc.
Term 1
1 10 _ 12 L Y 1092 94.6 6.0 20.00 0.17
2 31 32 _ L N 1068 88.6 6.0 17.00 0.26
3 _ 97 98 H N 1028 84.1 8.0 21.00 0.35
4 81 _ 83 H N 982 82.6 6.0 15.00 0.42
5 48 49 _ M Y 892 83.6 6.0 15.00 0.41
6 7 _ 9 L N 810 91.6 4.0 9.00 0.20
7 53 _ 55 M N 680 90.0 5.0 11.00 0.45
8 _ 64 65 M N 555 85.6 5.0 11.00 0.52
9 27 28 _ L N 428 87.4 4.0 9.00 0.54
10 57 58 _ M N 330 82.4 4.0 8.00 0.66
11 _ 61 62 M Y 221 81.0 3.0 7.00 0.54
12 _ 89 90 H Y 150 70.7 5.0 9.00 0.74
13 _ 23 24 L N 107 61.7 3.0 6.75 0.83
14 41 _ 43 M N 87 64.4 2.0 4.25 0.75
15 5 _ 7 L N 64 60.9 3.0 9.10 0.72
16 _ 95 96 H N 47 57.4 3.0 4.70 0.52
17 _ 15 16 L N 45 22.2 2.0 3.00 -0.32
18 30 31 _ L Y 38 15.8 2.5 3.00 -0.31
19 77 _ 79 H N 23 17.4 2.0 2.85 -0.16
20 _ 81 82 H Y 16 18.8 1.0 4.60 NA
21 48 _ 50 M Y 14 7.1 1.0 1.00 NA
22 97 98 _ H N 9 11.1 1.0 1.00 NA
23 63 64 _ M N 7 0.0 NA NA NA
24 55 56 _ M N 5 60.0 2.0 2.00 NA
25 _ 71 72 H Y 4 0.0 NA NA NA
26 28 _ 30 L Y 2 0.0 NA NA NA
27 5 _ 7 L N 1 100.0 1.0 1.00 NA
28 35 36 _ L N 1 0.0 NA NA NA
29 _ 14 15 L N 1 100.0 4.0 4.00 NA
30 22 _ 24 L N 1 0.0 NA NA NA
Term 3
1 10 _ 12 L Y 617 97.9 5.0 22.00 0.19
2 31 32 _ L N 609 93.8 5.0 16.00 0.20
3 _ 97 98 H N 584 90.8 6.0 19.00 0.28
4 81 _ 83 H N 560 91.8 5.0 13.00 0.30
5 48 49 _ M Y 521 91.9 5.0 12.00 0.33
6 7 _ 9 L N 498 94.2 4.0 8.00 0.10
7 53 _ 55 M N 452 94.5 5.0 11.00 0.32
8 _ 64 65 M N 383 93.5 5.0 10.00 0.37
9 27 28 _ L N 313 91.1 4.0 8.80 0.36
10 57 58 _ M N 257 90.3 4.0 8.00 0.57
11 _ 61 62 M Y 198 92.9 3.0 7.85 0.43
12 _ 89 90 H Y 131 86.3 5.0 10.00 0.57
13 _ 23 24 L N 101 81.2 3.0 6.00 0.79
14 41 _ 43 M N 76 88.2 2.0 5.00 0.57
15 5 _ 7 L N 48 79.2 3.0 5.00 0.73
16 _ 95 96 H N 30 86.7 2.5 5.00 0.61
17 _ 15 16 L N 24 70.8 2.0 4.20 0.67
18 30 31 _ L Y 16 56.2 2.0 3.00 NA
19 77 _ 79 H N 11 72.7 3.0 6.25 NA
20 _ 81 82 H Y 7 57.1 2.0 3.70 NA
21 48 _ 50 M Y 6 50.0 2.0 2.00 NA
22 97 98 _ H N 5 40.0 1.5 1.95 NA
23 63 64 _ M N 3 0.0 NA NA NA
24 55 56 _ M N 2 0.0 NA NA NA
25 _ 71 72 H Y 2 50.0 1.0 1.00 NA
26 28 _ 30 L Y 2 0.0 NA NA NA
27 5 _ 7 L N 2 0.0 NA NA NA
28 35 36 _ L N 2 0.0 NA NA NA
29 _ 14 15 L N 2 50.0 3.0 3.00 NA
30 22 _ 24 L N 1 0.0 NA NA NA
Term 4
1 10 _ 12 L Y 478 97.5 4.0 15.00 0.11
2 31 32 _ L N 466 97.2 4.0 12.00 0.20
3 _ 97 98 H N 471 94.3 5.0 15.70 0.21
4 81 _ 83 H N 457 94.5 5.0 12.00 0.24
5 48 49 _ M Y 442 94.6 5.0 12.00 0.21
6 7 _ 9 L N 432 91.9 3.0 8.00 0.15
7 53 _ 55 M N 395 95.4 4.0 11.00 0.28
8 _ 64 65 M N 350 94.9 5.0 11.00 0.29
9 27 28 _ L N 309 94.8 4.0 9.00 0.30
10 57 58 _ M N 251 94.0 4.0 7.00 0.31
11 _ 61 62 M Y 207 94.2 3.0 6.30 0.31
12 _ 89 90 H Y 140 89.3 4.0 9.00 0.58
13 _ 23 24 L N 116 89.7 3.0 6.00 0.35
14 41 _ 43 M N 86 93.0 2.0 5.05 0.35
15 5 _ 7 L N 62 91.9 3.0 5.00 0.51
16 _ 95 96 H N 45 93.3 3.0 6.00 0.57
17 _ 15 16 L N 36 86.1 3.0 4.50 0.58
18 30 31 _ L Y 28 85.7 2.0 4.00 0.79
19 77 _ 79 H N 24 75.0 2.5 4.00 0.87
20 _ 81 82 H Y 17 82.4 2.0 4.00 NA
21 48 _ 50 M Y 16 68.8 2.0 2.50 NA
22 97 98 _ H N 8 62.5 2.0 4.80 NA
23 63 64 _ M N 9 66.7 1.0 4.00 NA
24 55 56 _ M N 4 25.0 3.0 3.00 NA
25 _ 71 72 H Y 4 75.0 2.0 3.80 NA
26 28 _ 30 L Y 3 33.3 1.0 1.00 NA
27 5 _ 7 L N 2 0.0 NA NA NA
28 35 36 _ L N 2 0.0 NA NA NA
29 _ 14 15 L N 2 0.0 NA NA NA
30 22 _ 24 L N 2 0.0 NA NA NA

Question type labels

Label Description
Range
H starting number 70 or more
M starting number 40-69
L starting number less than 40
Cross Decade
N sequence does not include a decade number
Y sequence includes a decade number

Download item stats (CSV)

NoteItem discrimination

Item discrimination (point-biserial) measures how well an item separates higher-ability from lower-ability students. Values above ~0.3 are typically “good”, below ~0.2 “weak”. In timed tests, late items can look artificially strong because only fast/able students reach them.

8. Item correct response time

Term 1

Term 3

Term 4

Term 1

Term 3

Term 4

Term 1

Term 3

Term 4

Term 1

Term 3

Term 4

9. Question type performance

This section shows performance grouped by different question characteristics.

Foundation

MNA0-20

Error Type
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-20 (MNA0-20_2025)
skipped number 1/3 1035 70.8 5.45 0.00 8.57
repeated number 1/3 949 79.9 7.50 0.00 10.00
skipped decade number 1.1/3 748 75.8 8.57 0.00 10.00
inconsistent order 1.2/3 508 77.4 12.00 0.00 12.00
reversed digits 1.4/3 406 40.1 0.00 0.00 15.00
Term 3 – Missing Number Ascending 0-20 (MNA0-20_2025)
skipped number 1/3 608 81.1 9.29 0.00 12.00
repeated number 1/3 599 90.5 12.00 4.62 15.00
skipped decade number 1.1/3 569 85.8 10.00 4.29 12.00
inconsistent order 1.2/3 476 87.4 12.00 6.67 15.00
reversed digits 1.3/3 409 37.9 0.00 0.00 10.00
Term 4 – Missing Number Ascending 0-20 (MNA0-20_2025)
skipped number 1/3 510 82.7 10.00 0.00 12.00
repeated number 1.1/3 507 91.7 12.00 6.67 15.00
skipped decade number 1.1/3 523 86.0 12.00 6.00 15.00
inconsistent order 1.2/3 491 89.4 12.00 8.57 15.00
reversed digits 1.4/3 448 51.3 4.62 0.00 10.00


Fluency by Error Type

Error Position
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-20 (MNA0-20_2025)
middle digits 1.8/6 1684 78.6 7.50 0.00 8.57
first digit 1.7/4 1739 67.7 6.00 0.00 7.50
last digit 1.8/5 223 51.1 10.91 0.00 17.14
Term 3 – Missing Number Ascending 0-20 (MNA0-20_2025)
middle digits 1.9/6 1161 87.9 10.00 4.29 12.00
first digit 2.1/4 1327 73.9 7.50 3.16 8.57
last digit 1.6/5 173 53.8 8.57 0.00 12.00
Term 4 – Missing Number Ascending 0-20 (MNA0-20_2025)
middle digits 2.1/6 1024 88.5 10.91 5.45 13.33
first digit 2.4/4 1213 76.8 8.57 4.44 10.00
last digit 1.7/5 242 69.8 12.00 0.00 15.00


Fluency by Error Position

Cross Decade
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-20 (MNA0-20_2025)
erroneous sequence within decade 2.3/11 2487 68.4 5.71 1.94 7.06
erroneous sequence crossing decade 1.7/4 1159 78.8 8.57 0.00 10.00
Term 3 – Missing Number Ascending 0-20 (MNA0-20_2025)
erroneous sequence within decade 2.7/11 1686 73.1 7.50 3.53 8.57
erroneous sequence crossing decade 1.8/4 975 88.3 10.00 5.45 12.00
Term 4 – Missing Number Ascending 0-20 (MNA0-20_2025)
erroneous sequence within decade 3.1/11 1568 75.6 8.57 4.44 10.00
erroneous sequence crossing decade 1.9/4 911 90.0 12.00 6.32 13.33


Fluency by Cross Decade

MNC0-20

Range
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Choice 0-20 (MNC0-20_2025)
starting number < 10 2.8/15 3242 75.2 6.67 2.07 8.00
starting number ≥ 10 3.4/15 4203 64.7 3.75 0.00 5.00
Term 3 – Missing Number Choice 0-20 (MNC0-20_2025)
starting number < 10 3.1/15 2309 86.7 8.57 3.64 10.00
starting number ≥ 10 4/15 3060 82.5 6.21 1.88 7.74
Term 4 – Missing Number Choice 0-20 (MNC0-20_2025)
starting number < 10 3.5/15 1930 90.8 9.60 5.00 10.91
starting number ≥ 10 4.6/15 2565 87.1 8.00 3.24 9.23


Fluency by Range

Cross Decade
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Choice 0-20 (MNC0-20_2025)
sequence doesn't include a decade number 5.2/26 6484 69.0 4.09 1.20 5.58
sequence includes a decade number 1/4 961 71.6 7.50 0.00 10.00
Term 3 – Missing Number Choice 0-20 (MNC0-20_2025)
sequence doesn't include a decade number 6.1/26 4697 84.2 6.43 2.61 8.08
sequence includes a decade number 1/4 672 84.7 10.00 0.00 12.00
Term 4 – Missing Number Choice 0-20 (MNC0-20_2025)
sequence doesn't include a decade number 7.1/26 3960 88.5 8.18 3.75 9.33
sequence includes a decade number 1/4 535 89.7 12.00 5.45 15.00


Fluency by Cross Decade

Year 1

MNA0-100

Error Type
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-100 (MNA0-100_2025)
skipped number 1/3 1298 81.4 6.00 0.00 7.50
repeated number 1/4 1276 88.0 12.00 3.33 12.00
skipped decade number 1/4 1130 77.8 6.67 0.00 8.57
inconsistent order 1.1/4 512 71.5 10.00 0.00 12.00
reversed digits 1.4/4 312 73.1 12.00 0.00 15.00
Term 3 – Missing Number Ascending 0-100 (MNA0-100_2025)
skipped number 1/3 859 83.0 7.50 0.00 8.57
repeated number 1/4 863 91.3 15.00 7.50 15.00
skipped decade number 1/4 818 78.7 8.57 0.00 10.00
inconsistent order 1.1/4 530 79.1 12.00 0.00 15.00
reversed digits 1.4/4 332 78.3 12.00 0.00 15.00
Term 4 – Missing Number Ascending 0-100 (MNA0-100_2025)
skipped number 1/3 588 82.7 8.57 0.00 10.00
repeated number 1/4 576 90.6 15.00 6.67 20.00
skipped decade number 1/4 569 80.7 10.00 0.00 12.00
inconsistent order 1.1/4 422 79.6 12.00 0.00 15.00
reversed digits 1.4/4 293 79.9 12.00 0.00 15.00


Fluency by Error Type

Error Position
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-100 (MNA0-100_2025)
middle digits 3.2/9 4127 81.8 6.32 3.12 7.50
first digit 1.5/5 12 50.0 0.00 0.00 45.00
last digit 1.7/5 389 70.2 12.00 0.00 15.00
Term 3 – Missing Number Ascending 0-100 (MNA0-100_2025)
middle digits 3.4/9 2959 84.4 8.18 4.14 9.47
first digit 1.5/5 17 52.9 20.00 0.00 60.00
last digit 1.7/5 426 74.6 12.00 5.23 15.00
Term 4 – Missing Number Ascending 0-100 (MNA0-100_2025)
middle digits 3.6/9 2081 84.2 9.23 4.62 10.59
first digit 1.8/5 14 42.9 17.50 0.00 24.00
last digit 1.6/5 353 78.8 12.00 0.00 15.00


Fluency by Error Position

Range
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-100 (MNA0-100_2025)
0-39 4/19 5293 86.9 8.00 4.19 9.23
40-59 1.4/11 1744 86.3 8.57 3.53 10.00
60-100 2.6/10 2934 84.5 7.50 4.00 9.00
Term 3 – Missing Number Ascending 0-100 (MNA0-100_2025)
0-39 4.6/19 3968 89.2 10.00 5.45 11.11
40-59 1.7/11 1411 90.3 10.00 6.00 12.00
60-100 3/10 2396 87.9 9.00 5.22 10.43
Term 4 – Missing Number Ascending 0-100 (MNA0-100_2025)
0-39 4.9/19 2834 89.0 10.91 6.86 12.00
40-59 1.8/11 1060 92.7 10.91 5.45 12.00
60-100 3.1/10 1785 88.0 9.47 5.45 10.91


Fluency by Range

Cross Decade
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Ascending 0-100 (MNA0-100_2025)
erroneous sequence within decade 2.6/13 3343 81.9 7.06 3.00 8.57
erroneous sequence crossing decade 1.1/6 1185 77.1 6.67 0.00 8.57
Term 3 – Missing Number Ascending 0-100 (MNA0-100_2025)
erroneous sequence within decade 2.9/13 2514 84.9 9.23 4.00 10.00
erroneous sequence crossing decade 1.1/6 888 77.7 8.57 0.00 10.00
Term 4 – Missing Number Ascending 0-100 (MNA0-100_2025)
erroneous sequence within decade 3.1/13 1829 84.1 10.00 4.71 11.25
erroneous sequence crossing decade 1.1/6 619 80.5 10.00 0.00 12.00


Fluency by Cross Decade

MNC0-100

Range
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Choice 0-100 (MNC0-100_2025)
starting number less than 40 3.3/13 3658 88.0 9.00 4.00 10.51
starting number 40-69 3.1/9 2791 84.0 8.57 4.00 10.00
starting number 70 or more 2.2/8 2259 80.4 7.06 2.07 8.57
Term 3 – Missing Number Choice 0-100 (MNC0-100_2025)
starting number less than 40 3.6/13 2235 92.9 10.59 4.62 12.00
starting number 40-69 3.6/9 1898 92.2 10.00 6.00 12.00
starting number 70 or more 2.2/8 1330 90.1 8.57 3.53 10.91
Term 4 – Missing Number Choice 0-100 (MNC0-100_2025)
starting number less than 40 4/13 1938 94.2 12.00 7.06 14.12
starting number 40-69 3.8/9 1760 94.1 11.43 6.32 13.04
starting number 70 or more 2.4/8 1166 92.9 10.91 5.22 12.86


Fluency by Range

Cross Decade
Median fluency (correct/min)
Question type Avg items attempted No. response % Correct All Bottom 25% Top 75%
Term 1 – Missing Number Choice 0-100 (MNC0-100_2025)
sequence doesn't include a decade number 5.7/21 6279 84.5 8.00 3.16 9.33
sequence includes a decade number 2.2/9 2429 85.4 8.00 3.75 10.00
Term 3 – Missing Number Choice 0-100 (MNC0-100_2025)
sequence doesn't include a decade number 6.3/21 3963 91.5 9.47 4.45 11.05
sequence includes a decade number 2.4/9 1500 93.1 10.00 4.44 12.00
Term 4 – Missing Number Choice 0-100 (MNC0-100_2025)
sequence doesn't include a decade number 7.3/21 3529 93.7 10.91 6.25 12.31
sequence includes a decade number 2.8/9 1335 94.2 11.25 6.32 13.33


Fluency by Cross Decade