Count to 20 — Answer Key
Part A: Fill in the Missing Number
Write the missing number on each line.
1. 3, 4, 5, 6.
Counting in order: 3, 4, 5, 6. The missing number is 5.
2. 8, 9, 10, 11.
Counting in order: 8, 9, 10, 11. The missing number is 9.
3. 14, 15, 16, 17.
Counting in order: 14, 15, 16, 17. The missing number is 15.
4. 11, 12, 13, 14.
Counting in order: 11, 12, 13, 14. The missing number is 13.
5. 17, 18, 19, 20.
Counting in order: 17, 18, 19, 20. The missing number is 19.
6. 6, 7, 8, 9, 10.
Counting in order: 6, 7, 8, 9, 10. The missing number is 8.
7. 1, 2, 3, 4, 5.
Counting in order: 1, 2, 3, 4, 5. The missing number is 1.
8. 12, 13, 14, 15, 16.
Counting in order: 12, 13, 14, 15, 16. The missing number is 15.
9. 18, 19, 20, and you are done!
Counting forward from 19: the next number is 20, which completes the count to 20.
Part B: Matching
Match each number sequence clue to the correct answer.
1. Draw a line to match.
The number after 15
→ 16
19
The number between 11 and 13
→ 12
10
Count on 2 from 8
→ 10
12
The number before 20
→ 19
16
After 15→16, between 11 and 13→12, count on 2 from 8→10, before 20→19.