Count to 20 — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. What number comes right before 18?
A) 16
B) 17
C) 19
D) 20
The number just before 18 is 17. The sequence is 17, 18, 19.
2. If you count back 2 from 15, where do you land?
A) 17
B) 14
C) 13
D) 12
15 - 2 = 13. Counting back 2 from 15: 14, 13.
3. Which number is between 11 and 13?
A) 10
B) 11
C) 12
D) 14
In the sequence 11, 12, 13 — the number between 11 and 13 is 12.
4. Start at 1 and count forward 10. What number do you reach?
A) 10
B) 11
C) 12
D) 9
1 + 10 = 11. Starting at 1 and counting forward 10 steps lands on 11.
Part B: Fill in the Missing Number
Write the missing number on each line.
1. Count back: 20, 19, 18, 17.
Counting backward: 20, 19, 18, 17. The missing number is 18.
2. 2 less than 16 is 14.
16 - 2 = 14. Two less than 16 is 14.
3. Count back: 13, 12, 11, 10.
Counting backward: 13, 12, 11, 10. The missing number is 11.
4. The number between 18 and 20 is 19.
In the sequence 18, 19, 20 — the number between 18 and 20 is 19.
5. 3 more than 10 is 13.
10 + 3 = 13. Three more than 10 is 13.