Explore number patterns on a chart with ten numbers in each row. Fill the missing cells, read the numbers aloud, and use neighboring numbers to explain each answer. Choose a chart ending at 100 or 120.
A completed answer key shows the same chart with every number filled in. Use a few missing cells for a gentle start, or hide more numbers when the learner can follow the pattern confidently.
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Fill in the missing numbers.
| 1 | 2 | Missing number___ | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | Missing number___ | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | Missing number___ | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 | 32 | Missing number___ | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| 41 | Missing number___ | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
| 51 | 52 | 53 | Missing number___ | 55 | 56 | 57 | 58 | 59 | 60 |
| 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
| 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 |
| 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 |
Choose your settings to create a fresh set with matching answers.
Start at the upper left and read across each row. In this chart, moving one cell right adds 1. Moving down one row adds 10 because each row contains ten numbers. At the end of a row, the next counting number starts the following row.
Suppose a row reads 21, 22, 23, 24, 25, __, 27, 28, 29, 30. The missing number is 26: it is one more than 25 and one less than 27. The cell immediately below it is 36, which is ten greater.
For first-grade counting practice, a 1–120 chart supports reading and continuing the counting sequence. In second grade, use it to notice tens patterns. A 120 chart is a small part of second-grade counting work, which extends beyond 120.
Ask the learner to explain a blank using two different clues before checking the answer key. Counting every cell from 1 can work, but noticing nearby numbers is more efficient.