Skip Counting by 2s, 5s, and 10s — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. Sam counts: 20, 30, 40, 50. What is Sam counting by?
A) 2s
B) 5s
C) 10s
D) 20s
Sam is counting by 10s because each number increases by 10: 20 + 10 = 30, 30 + 10 = 40, 40 + 10 = 50.
2. Which number is missing? 25, 30, ___, 40, 45.
A) 32
B) 33
C) 35
D) 37
The missing number is 35 because this is counting by 5s: 25, 30, 35, 40, 45.
3. Mia counts by 2s from 60. What are the next three numbers?
A) 61, 62, 63
B) 62, 64, 66
C) 70, 80, 90
D) 65, 70, 75
Counting by 2s from 60 gives 62, 64, 66 because you add 2 each time.
4. Which list shows counting by 5s?
A) 50, 55, 60, 65
B) 50, 52, 54, 56
C) 50, 60, 70, 80
D) 51, 56, 61, 66
50, 55, 60, 65 shows counting by 5s because each number is 5 more than the last.
Part B: Fill in the Missing Number
Write the missing number on each line.
1. Count by 2s: 66, 68, 70, 72, 74.
Counting by 2s, add 2 to 70 to get 72.
2. Count by 5s: 90, 95, 100, 105, 110.
Counting by 5s, add 5 to 100 to get 105.
3. Count by 10s: 50, 60, 70, 80, 90.
Counting by 10s, add 10 to 80 to get 90.
4. Count by 2s: 94, 96, 98, 100, 102.
Counting by 2s, add 2 to 96 to get 98.
5. Count by 5s: 105, 110, 115, 120.
Counting by 5s, add 5 to 110 to get 115.