Subtract 7: Subtraction Facts
| 8 − 7 = 1 (matching addition: 7 + 1 = 8) |
| 9 − 7 = 2 (matching addition: 7 + 2 = 9) |
| 10 − 7 = 3 (matching addition: 7 + 3 = 10) |
| 11 − 7 = 4 (matching addition: 7 + 4 = 11) |
| 12 − 7 = 5 (matching addition: 7 + 5 = 12) |
| 13 − 7 = 6 (matching addition: 7 + 6 = 13) |
| 14 − 7 = 7 (matching addition: 7 + 7 = 14) |
| 15 − 7 = 8 (matching addition: 7 + 8 = 15) |
| 16 − 7 = 9 (matching addition: 7 + 9 = 16) |
| 17 − 7 = 10 (matching addition: 7 + 10 = 17) |
| 18 − 7 = 11 (matching addition: 7 + 11 = 18) |
| 19 − 7 = 12 (matching addition: 7 + 12 = 19) |
Zoorithmetic https://zoorithmetic.com/
Subtract 7 takes away almost a week, and its answers are easy when the matching addition fact is known.
The pattern in the answers
Starting numbers 8 to 19 give answers 1 to 12; in the middle, 14 - 7 = 7 is the double that halves 14.
Tip for the subtract 7 facts
Think of the add: 15 - 7 asks what plus 7 makes 15, and 7 + 8 = 15, so the answer is 8. Or go back through ten: 15 - 5 = 10, then 2 more makes 8.
The 3 hardest facts
- 13 − 7 = 6 (matching addition: 7 + 6 = 13)
- 15 − 7 = 8 (matching addition: 7 + 8 = 15)
- 16 − 7 = 9 (matching addition: 7 + 9 = 16)
Take 7 off a teen number and the answer is small. Bridge through ten: 16 - 6 = 10, and then 1 more makes 9.
Check with addition
Every subtraction fact is an addition fact turned around. Add the answer back to 7 to get the number you started with.
- 1 + 7 = 8, so 8 − 7 = 1
- 2 + 7 = 9, so 9 − 7 = 2
- 3 + 7 = 10, so 10 − 7 = 3
- 4 + 7 = 11, so 11 − 7 = 4
- 5 + 7 = 12, so 12 − 7 = 5
- 6 + 7 = 13, so 13 − 7 = 6
- 7 + 7 = 14, so 14 − 7 = 7
- 8 + 7 = 15, so 15 − 7 = 8
- 9 + 7 = 16, so 16 − 7 = 9
- 10 + 7 = 17, so 17 − 7 = 10
- 11 + 7 = 18, so 18 − 7 = 11
- 12 + 7 = 19, so 19 − 7 = 12
Play the subtract 7 facts game
Untimed by default. A missed fact shows its answer and comes back later in the round.
Printable subtract 7 chart
One US Letter page, clear in black and white.
Quick quiz: subtract 7 facts
10 questions, no timer. At the end you see the score, the facts to practice and a sheet you can print.
Questions parents ask
What is the trick for 15 - 7?
Split 7 into 5 and 2: 15 - 5 = 10, then 10 - 2 = 8. Going through ten makes it manageable.
Why use the matching addition fact?
7 + 8 = 15 is a fact many children already know. The subtraction fact uses the same three numbers in a different order.