Maths trick
The nines trick
To multiply by 9, multiply by 10 and take one lot away.
Ages 8–10
Worked example
Tap through the steps. Each step can be read aloud.
Step 1 of 4
9 × 7: 9 is one less than 10.
Quick practice
Five fresh questions, marked straight away. Use the trick!
To multiply by 9, multiply by 10 and take one lot away.
