Multiplication by 10, step by step
The ten times table is the easiest to answer and the most useful to understand.
The question
8 × 10
8×10
8 × 10=10 × 8
8 × 5=40
8 × 5=40
40+40=80
8×10=80
- 8 × 10 means 8 groups with 10 in each one — 8 rows of 10. The answer counts everything in all of them, not one row.
- Added up, that is 10 written 8 times — nobody wants to do that. Turn it round: 10 × 8 is the same amount, and it is only 10 lots of 8 to add instead.
- If 8 × 10 will not come, split the 10 at five: 8 × 5 = 40, and 8 × 5 = 40. Together that is 40 + 40 = 80.
- So 8 × 10 = 80.
How it works.
- 01
8 × 10 means 8 groups with 10 in each one — 8 rows of 10. The answer counts everything in all of them, not one row.
- 02
Added up, that is 10 written 8 times — nobody wants to do that. Turn it round: 10 × 8 is the same amount, and it is only 10 lots of 8 to add instead.
- 03
If 8 × 10 will not come, split the 10 at five: 8 × 5 = 40, and 8 × 5 = 40. Together that is 40 + 40 = 80.
- 04
So 8 × 10 = 80.