1st Grade Number Sequences Worksheets

1. 1.Fill in the missing number: 10, 11, 12, 13, ___
2. 2.Fill in the missing number: 10, ___, 12, 13, 14
3. 3.Fill in the missing number: 8, ___, 12, 14, 16
4. 4.Fill in the missing number: 9, 10, ___, 12, 13
5. 5.Fill in the missing number: 3, ___, 7, 9, 11
6. 6.Fill in the missing number: 10, 12, 14, ___, 18
7. 7.Fill in the missing number: 3, 5, ___, 9, 11
8. 8.Fill in the missing number: 5, 6, 7, 8, ___
9. 9.Fill in the missing number: 6, 7, ___, 9, 10
10. 10.Fill in the missing number: 6, ___, 8, 9, 10
11. 11.Fill in the missing number: 2, 4, 6, 8, ___
12. 12.Fill in the missing number: 8, ___, 10, 11, 12
13. 13.Fill in the missing number: 10, ___, 14, 16, 18
14. 14.Fill in the missing number: 0, 1, 2, 3, ___
15. 15.Fill in the missing number: 1, 3, 5, ___, 9
16. 16.Fill in the missing number: 4, 6, 8, ___, 12
17. 17.Fill in the missing number: 9, 10, 11, ___, 13
18. 18.Fill in the missing number: 9, ___, 11, 12, 13
19. 19.Fill in the missing number: 2, ___, 6, 8, 10
20. 20.Fill in the missing number: 0, 1, ___, 3, 4

Every worksheet is generated with validated, duplicate-free problems and laid out to fit cleanly on US Letter paper. Choose your own difficulty, problem count, and answer key on the builder.