Subtraction within twenty
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. 16 − 7 = ?
2. 17 − 9 = ?
3. 18 − 9 = ?
4. 14 − 6 = ?
5. 11 − 2 = ?
Answer key · Subtraction within twenty
1. 9
Split 7 into 6 and 1.
Take 6 to reach ten: 16 − 6 = 10.
Take the other 1: 10 − 1 = 9.
So 16 − 7 = 9.
2. 8
Split 9 into 7 and 2.
Take 7 to reach ten: 17 − 7 = 10.
Take the other 2: 10 − 2 = 8.
So 17 − 9 = 8.
3. 9
Split 9 into 8 and 1.
Take 8 to reach ten: 18 − 8 = 10.
Take the other 1: 10 − 1 = 9.
So 18 − 9 = 9.
4. 8
Split 6 into 4 and 2.
Take 4 to reach ten: 14 − 4 = 10.
Take the other 2: 10 − 2 = 8.
So 14 − 6 = 8.
5. 9
Split 2 into 1 and 1.
Take 1 to reach ten: 11 − 1 = 10.
Take the other 1: 10 − 1 = 9.
So 11 − 2 = 9.
Try it together
Make a small group of blocks. Remove some and ask how many are left. Say and write the subtraction together, then put the blocks back to check.