Skip Counting — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each number into the correct skip-counting group.
Counting by 5s Only
152535 Counting by 10s Only
4070110 Numbers that count by 10s are also multiples of 5, but sequences like 5, 15, 25, 35 only appear when counting by 5s. Sequences like 10, 20, 30, 40 appear when counting by 10s.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 10, 20, 30, 40, 50.
This sequence counts by 10s. The next number after 40 is 40 + 10 = 50.
2. 45, 50, 55, 60, 65.
This sequence counts by 5s. The next number after 60 is 60 + 5 = 65.
3. 80, 90, 100, 110, 120.
This sequence counts by 10s. The missing number between 90 and 110 is 90 + 10 = 100.
4. 55, 60, 65, 70, 75.
This sequence counts by 5s. The missing number between 60 and 70 is 60 + 5 = 65.
5. 120, 130, 140, 150, 160.
This sequence counts by 10s. The missing number between 140 and 160 is 140 + 10 = 150.
Part C: True or False?
Read each statement. Circle True or False.
1. 10, 20, 30, 40 is counting by 10s.
True False
Each number is 10 more than the one before it: 10 + 10 = 20, 20 + 10 = 30, 30 + 10 = 40.
2. 5, 15, 25, 35 is counting by 10s.
True False
This sequence counts by 10s between numbers, but starts at 5, not a multiple of 10. This is counting by 10s from 5, not the standard count-by-10s pattern from 0.
3. 25, 30, 35, 40 is counting by 5s.
True False
Each number is 5 more than the one before it: 25 + 5 = 30, 30 + 5 = 35, 35 + 5 = 40.
4. 40, 50, 70, 80 is counting by 10s.
True False
This sequence skips 60. Counting by 10s from 40 should be 40, 50, 60, 70, 80.