Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 869 · 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 64 =
2. 2.Double 28 =
3. 3.Double 76 =
4. 4.Double 62 =
5. 5.Double 99 =
6. 6.Half of 112 =
7. 7.Half of 60 =
8. 8.Double 87 =
9. 9.Half of 26 =
10. 10.Half of 132 =
11. 11.Double 37 =
12. 12.Double 69 =
13. 13.Double 49 =
14. 14.Double 26 =
15. 15.Half of 52 =
16. 16.Double 55 =
17. 17.Half of 146 =
18. 18.Half of 162 =
19. 19.Double 67 =
20. 20.Half of 78 =
21. 21.Double 75 =
22. 22.Double 34 =
23. 23.Half of 88 =
24. 24.Half of 128 =
25. 25.Double 92 =
26. 26.Half of 190 =
27. 27.Double 83 =
28. 28.Double 97 =
29. 29.Double 71 =
30. 30.Double 84 =
31. 31.Half of 36 =
32. 32.Half of 38 =
33. 33.Double 36 =
34. 34.Half of 76 =
35. 35.Half of 28 =
36. 36.Half of 188 =
37. 37.Half of 160 =
38. 38.Double 58 =
39. 39.Half of 94 =
40. 40.Half of 198 =

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