Subtraction Within 20 (Regrouping) — Answer Key
Part A: Trace the Words
Trace each word carefully by following the dotted lines.
1. take
2. fewer
3. minus
4. left
5. less
6. away
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 18 - 9 = 9
This is a doubles fact: 9 + 9 = 18, so taking 9 away from 18 leaves 9.
2. 15 - 8 = 7
Split 8 into 5 and 3: 15 - 5 = 10, then 10 - 3 = 7.
3. 12 - 5 = 7
Break 5 into 2 and 3: 12 - 2 = 10, then 10 - 3 = 7.
4. 11 - 4 = 7
Take 1 off to land on 10 (11 - 1 = 10), then subtract 3 more to reach 7.
Part C: True or False?
Read each statement. Circle True or False.
1. 13 - 6 = 7
True False
This is true because 6 and 7 are partners that make 13, so 13 - 6 leaves 7.
2. 16 - 7 = 8
True False
This is false: the correct answer is 9 because 7 + 9 = 16, not 7 + 8.
3. 14 - 8 = 6
True False
This is true since 8 + 6 = 14, making 6 the number left when we take 8 from 14.