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 2s
61420 Counting by 3s Only
92127 6, 14, and 20 are even numbers you land on when counting by 2s from 0, while 9, 21, and 27 show up when counting by 3s (3, 6, 9, ... 21, 24, 27) but are not even.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 6, 8, 10, 12, 14.
This list counts by 2s, so the number after 10 is 10 + 2 = 12, which is also 2 less than 14.
2. 9, 12, 15, 18, 21.
Each number jumps up by 3 (9 to 12, 12 to 15), so after 15 you add 3 to get 18, and 18 + 3 = 21.
3. 16, 18, 20, 22, 24.
The numbers go up by 2 each step, and 18 + 2 = 20. That matches 22 being 2 more than 20.
4. 21, 24, 27, 30, 33.
This is a count-by-3s pattern, so 27 + 3 = 30, and 30 + 3 = 33 lines up with the next number in the list.
5. 2, 4, 6, 8, 10.
The pattern skips by 2s, so to find the first number you go backward: 4 - 2 = 2, which is the first even number in the count.
Part C: True or False?
Read each statement. Circle True or False.
1. 4, 6, 8, 10 is counting by 2s.
True False
The gap between each pair is 2 (4 + 2 = 6, 6 + 2 = 8, 8 + 2 = 10), which is exactly what counting by 2s means.
2. 3, 6, 8, 12 is counting by 3s.
True False
The jump from 6 to 8 is only 2, which breaks the count-by-3s rule. A real count-by-3s would go 3, 6, 9, 12.
3. 12, 15, 18, 21 is counting by 3s.
True False
Each number is 3 more than the one before (12 + 3 = 15, 15 + 3 = 18, 18 + 3 = 21), so the pattern is a count-by-3s.
4. 10, 12, 15, 16 is counting by 2s.
True False
The jump from 12 to 15 is 3, not 2, so this breaks the pattern. Counting by 2s from 10 would give 10, 12, 14, 16.