How to multiply by 11 in your head

For ages 7 to 10 (Years 3 to 5) · 2-minute read · free worksheet

Multiplying a two-digit number by 11 takes one addition. Children are usually amazed the first time it works.

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Worksheet includes an answer key for grown-ups

How it works

  1. Split the two digits apart.
  2. Add them together.
  3. Put the total in the middle.

Worked example

34 × 11: split into 3 _ 4. 3 + 4 = 7. Put 7 in the middle: 374.

Top tip

If the middle is 10 or more, carry the 1: 76 × 11, 7 + 6 = 13, keep the 3, add 1 to the 7: 836.
How to multiply by 11 in your head: 34 × 11 = ? 3 + 4 = 7 in the middle: 374

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