Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 839 · 40 questions

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

1. 1.Double 88 =
2. 2.Double 86 =
3. 3.Half of 34 =
4. 4.Half of 136 =
5. 5.Double 94 =
6. 6.Double 49 =
7. 7.Half of 174 =
8. 8.Double 62 =
9. 9.Double 53 =
10. 10.Double 52 =
11. 11.Double 42 =
12. 12.Half of 66 =
13. 13.Half of 130 =
14. 14.Double 22 =
15. 15.Half of 180 =
16. 16.Half of 62 =
17. 17.Double 27 =
18. 18.Double 93 =
19. 19.Half of 88 =
20. 20.Half of 54 =
21. 21.Double 91 =
22. 22.Half of 70 =
23. 23.Double 38 =
24. 24.Half of 26 =
25. 25.Half of 50 =
26. 26.Half of 52 =
27. 27.Double 35 =
28. 28.Half of 72 =
29. 29.Half of 166 =
30. 30.Half of 40 =
31. 31.Double 18 =
32. 32.Half of 172 =
33. 33.Double 25 =
34. 34.Half of 84 =
35. 35.Half of 44 =
36. 36.Double 99 =
37. 37.Half of 94 =
38. 38.Half of 58 =
39. 39.Half of 108 =
40. 40.Half of 114 =

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