How to multiply two-digit numbers: the criss-cross method

For ages 9 to 11 (Years 5 and 6) · 2-minute read · free worksheet

The criss-cross method multiplies two two-digit numbers in one line, working from right to left. It is quicker than long multiplication once practised.

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Worksheet includes an answer key for grown-ups

How it works

  1. Multiply the right-hand digits for the ones.
  2. Criss-cross: multiply diagonally and add, for the tens.
  3. Multiply the left-hand digits for the hundreds.
  4. Carry anything over 9 to the left.

Worked example

12 × 13: ones 2 × 3 = 6. Tens 1 × 3 + 2 × 1 = 5. Hundreds 1 × 1 = 1. Answer: 156.

Top tip

With carrying: 32 × 64. Ones 2 × 4 = 8. Tens 3 × 4 + 2 × 6 = 24, write 4, carry 2. Hundreds 3 × 6 = 18, plus 2 = 20. Answer: 2048.
How to multiply two-digit numbers: the criss-cross method: 12 × 13 = ? Right 6, cross 5, left 1: 156

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