Double and halve Worksheet
A printable mental math worksheet for the trick "double and halve". Halve one number and double the other until it gets easy. 16 × 25 = 8 × 50 = 400. 30 problems with an answer key.
30 problems · answer key on page 2 · free, no login
What is on the sheet
Use the trick: Halve one number and double the other until it gets easy. 16 × 25 = 8 × 50 = 400. Write only the answer. The answer key is on page 2.
- 1. 44 × 15 = ___
- 2. 10 × 35 = ___
- 3. 12 × 5 = ___
- 4. 12 × 35 = ___
- 5. 38 × 15 = ___
- 6. 46 × 45 = ___
- 7. 22 × 45 = ___
- 8. 30 × 45 = ___
- 9. 32 × 5 = ___
- 10. 22 × 35 = ___
- 11. 36 × 45 = ___
- 12. 24 × 45 = ___
The first 12 of 30 problems.
How to use it
- Print one copy per day and set a timer for 1 minute.
- Write the score at the top and try to beat it the next day.
- Check with the answer key and practise the ones that were wrong.