Table strategy: 1× more and 1× less
You learn to work out hard times table facts with an easy helper sum from the 5 or 10 times table.
How to work it out
- Use an easy helper sum of 5× or 10×.
- Work out 6× by adding 1× to 5×.
- Work out 9× by taking 1× away from 10×.
5 × 7 + 1 × 7
6 × 7
- Think of the helper sum from the 5 times table: 5 × 7 = 35.
- Add another 1 × 7 on top: 35 + 7 = 42.
- So 6 × 7 = 42.
More examples
9 × 8
- Think of the helper sum from the 10 times table: 10 × 8 = 80.
- Take away 1 × 8: 80 − 8 = 72.
- So 9 × 8 = 72.
10 × 8 − 1 × 8
4 × 7
- Think of 5 × 7 = 35.
- Take away 1 × 7: 35 − 7 = 28.
- So 4 × 7 = 28.
4 × 7