Subtraction Within 20 — Answer Key
Part A: Solve the Subtraction Problems
Subtract the numbers. Write the answer on the line.
12
-5
7
14
-6
8
11
-3
8
15
-7
8
13
-4
9
12
-8
4
15
-9
6
11
-6
5
Part B: Fill in the Missing Number
Complete each sentence by writing the missing number on the line.
1. Start with 14, take away 5, and you have 9 left.
14 - 5 = 9.
2. Start with 13, take away 8, and you have 5 left.
13 - 8 = 5.
3. Start with 11, take away 7, and you have 4 left.
11 - 7 = 4.
4. Start with 15, take away 6, and you have 9 left.
15 - 6 = 9.
5. Start with 12, take away 9, and you have 3 left.
12 - 9 = 3.
Part C: True or False
Read each statement. Write True or False on the line.
1. 13 - 6 = 7
True False
True -- 13 - 6 = 7.
2. 15 - 8 = 6
True False
False -- 15 - 8 = 7, not 6.
3. 11 - 4 = 7
True False
True -- 11 - 4 = 7.