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Multiplication facts

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The question

9 × 2

9×2
9 × 2=2 × 9
2 × 10=20
20−2=18
9×2=18
  1. 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.
  2. 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.
  3. 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.
  4. So 9 × 2 = 18.

How it works.

  1. 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.

  2. 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.

  3. 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.

  4. 04

    So 9 × 2 = 18.

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