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Math Grade K-1 Answer Key

Number Patterns: What Number Is Missing?

Practice finding missing numbers in counting patterns

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Number Patterns: What Number Is Missing?

Practice finding missing numbers in counting patterns

Math - Grade K-1

Instructions: Read each number pattern. Write the missing number in the blank. Use counting to check your answer.
  1. 1

    What number is missing? 1, 2, __, 4, 5

    Count up by 1.

    The missing number is 3 because 3 comes after 2 and before 4.
  2. 2

    What number is missing? 6, 7, __, 9, 10

    The missing number is 8 because 8 comes after 7 and before 9.
  3. 3

    What number is missing? 10, 11, 12, __, 14

    Say the numbers in order starting at 10.

    The missing number is 13 because the pattern counts up by 1 each time.
  4. 4

    What number is missing? 3, 4, 5, __, 7

    The missing number is 6 because 6 comes after 5 and before 7.
  5. 5

    What number is missing? 0, 1, __, 3, 4

    Start at 0 and count one number at a time.

    The missing number is 2 because the pattern counts up by 1 from 0.
  6. 6

    What number is missing? 15, 16, __, 18, 19

    The missing number is 17 because 17 comes after 16 and before 18.
  7. 7

    What number is missing? 2, 4, __, 8, 10

    Skip count by 2: 2, 4, 6.

    The missing number is 6 because the pattern counts by 2s.
  8. 8

    What number is missing? 5, 10, __, 20, 25

    Count by 5s using your fingers if it helps.

    The missing number is 15 because the pattern counts by 5s.
  9. 9

    What number is missing? 10, 20, __, 40, 50

    The missing number is 30 because the pattern counts by 10s.
  10. 10

    What number is missing? 1, 3, __, 7, 9

    Add 2 to each number.

    The missing number is 5 because the pattern counts by 2s using odd numbers.
  11. 11

    What number is missing? 20, 19, __, 17, 16

    Count backward from 20.

    The missing number is 18 because the pattern counts backward by 1.
  12. 12

    What number is missing? 9, 8, 7, __, 5

    The missing number is 6 because 6 comes after 7 when counting backward.
  13. 13

    What number is missing? 4, 6, 8, __, 12

    Add 2 to 8.

    The missing number is 10 because the pattern counts up by 2.
  14. 14

    What number is missing? 30, 40, __, 60, 70

    The missing number is 50 because the pattern counts up by 10.
  15. 15

    What number is missing? 12, 13, 14, __, 16

    The missing number comes between 14 and 16.

    The missing number is 15 because the pattern counts up by 1.
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