Skip Counting by 2s, 5s, and 10s — Answer Key
Part A: Multiple Choice
Circle the correct answer for each question.
1. Which pattern is counting by 5s?
A) 2, 4, 6, 8
B) 5, 10, 15, 20
C) 10, 20, 30, 40
D) 3, 6, 9, 12
5, 10, 15, 20 is counting by 5s because each number is 5 more than the last.
2. Which number does NOT belong when counting by 2s: 10, 12, 15, 16?
A) 10
B) 12
C) 15
D) 16
15 does not belong because it is odd. When counting by 2s, you only say even numbers like 10, 12, 14, 16.
3. If you count by 10s starting at 50, what is the next number?
A) 55
B) 52
C) 60
D) 100
Counting by 10s from 50, the next number is 60 because you add 10 to 50.
4. The pattern is 70, 80, 90, ___. What rule is being used?
A) Count by 2s
B) Count by 5s
C) Count by 10s
D) Count by 3s
The rule is counting by 10s because each number increases by 10: 70 + 10 = 80, 80 + 10 = 90.
Part B: Fill in the Missing Number
Write the missing number on each line.
1. Count by 2s: 56, 58, 60, 62, 64.
Counting by 2s, add 2 to 58 to get 60.
2. Count by 5s: 85, 90, 95, 100, 105.
Counting by 5s, add 5 to 95 to get 100.
3. Count by 10s: 80, 90, 100, 110, 120.
Counting by 10s, add 10 to 100 to get 110.
4. Count by 2s: 74, 76, 78, 80, 82.
Counting by 2s, add 2 to 78 to get 80.
5. Count by 5s: 100, 105, 110, 115, 120.
Counting by 5s, add 5 to 110 to get 115.