Dividing by 10, step by step
Dividing by 10 is the friendliest fact of all: drop the zero and you are done.
The question
80 ÷ 10
80÷10
10×?=80
10×8=80
80÷10=8
8×10=80
- 80 ÷ 10 means sharing 80 out equally between 10. Deal them round one at a time until they run out; the answer is how many end up in one share.
- Dealing out 80 one at a time works, and takes all day. The shortcut is the same fact read backwards: 10 shares of WHAT makes 80?
- 10 × 8 = 80. That is the one, so 80 ÷ 10 = 8.
- Worth checking, because it costs one multiplication: 8 × 10 = 80. It matches, so the answer holds.
How it works.
- 01
80 ÷ 10 means sharing 80 out equally between 10. Deal them round one at a time until they run out; the answer is how many end up in one share.
- 02
Dealing out 80 one at a time works, and takes all day. The shortcut is the same fact read backwards: 10 shares of WHAT makes 80?
- 03
10 × 8 = 80. That is the one, so 80 ÷ 10 = 8.
- 04
Worth checking, because it costs one multiplication: 8 × 10 = 80. It matches, so the answer holds.