Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 51 · 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.Half of 198 =
2. 2.Half of 184 =
3. 3.Half of 180 =
4. 4.Double 37 =
5. 5.Double 93 =
6. 6.Double 58 =
7. 7.Half of 144 =
8. 8.Half of 64 =
9. 9.Double 39 =
10. 10.Double 91 =
11. 11.Double 57 =
12. 12.Double 18 =
13. 13.Double 99 =
14. 14.Double 89 =
15. 15.Half of 148 =
16. 16.Half of 46 =
17. 17.Half of 36 =
18. 18.Double 66 =
19. 19.Double 45 =
20. 20.Half of 136 =
21. 21.Double 53 =
22. 22.Half of 112 =
23. 23.Half of 74 =
24. 24.Half of 188 =
25. 25.Half of 168 =
26. 26.Half of 98 =
27. 27.Half of 26 =
28. 28.Half of 52 =
29. 29.Half of 150 =
30. 30.Double 44 =
31. 31.Double 33 =
32. 32.Double 52 =
33. 33.Double 96 =
34. 34.Double 59 =
35. 35.Half of 138 =
36. 36.Double 49 =
37. 37.Double 92 =
38. 38.Half of 140 =
39. 39.Half of 28 =
40. 40.Half of 96 =

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