Multiplication facts
The question
9 × 2
9×2
9 × 2=2 × 9
2 × 10=20
20−2=18
9×2=18
- 9 × 2 means 9 groups with 2 in each one — 9 rows of 2. The answer counts everything in all of them, not one row.
- Added up, that is 2 written 9 times — that is a lot of adding. Turn it round: 2 × 9 is the same amount, and it is only 2 lots of 9 to add instead.
- Nines are the easy ones. 2 × 10 = 20, and nine groups is one group short of ten — so take one 2 back off: 20 − 2 = 18.
- So 9 × 2 = 18.
How it works.
- 01
9 × 2 means 9 groups with 2 in each one — 9 rows of 2. The answer counts everything in all of them, not one row.
- 02
Added up, that is 2 written 9 times — that is a lot of adding. Turn it round: 2 × 9 is the same amount, and it is only 2 lots of 9 to add instead.
- 03
Nines are the easy ones. 2 × 10 = 20, and nine groups is one group short of ten — so take one 2 back off: 20 − 2 = 18.
- 04
So 9 × 2 = 18.