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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 530 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.Double 31 =
  2. 2.Half of 116 =
  3. 3.Double 58 =
  4. 4.Double 87 =
  5. 5.Double 94 =
  6. 6.Half of 66 =
  7. 7.Double 67 =
  8. 8.Half of 122 =
  9. 9.Half of 32 =
  10. 10.Half of 38 =
  11. 11.Half of 26 =
  12. 12.Double 55 =
  13. 13.Half of 44 =
  14. 14.Double 83 =
  15. 15.Double 91 =
  16. 16.Double 43 =
  17. 17.Double 34 =
  18. 18.Half of 130 =
  19. 19.Double 93 =
  20. 20.Double 81 =
  21. 21.Half of 68 =
  22. 22.Double 78 =
  23. 23.Half of 76 =
  24. 24.Double 46 =
  25. 25.Half of 78 =
  26. 26.Half of 96 =
  27. 27.Half of 92 =
  28. 28.Half of 60 =
  29. 29.Double 51 =
  30. 30.Double 22 =
  31. 31.Double 71 =
  32. 32.Half of 142 =
  33. 33.Double 26 =
  34. 34.Half of 160 =
  35. 35.Double 96 =
  36. 36.Double 99 =
  37. 37.Half of 120 =
  38. 38.Double 86 =
  39. 39.Half of 172 =
  40. 40.Double 21 =

Answer key

  1. 62
  2. 58
  3. 116
  4. 174
  5. 188
  6. 33
  7. 134
  8. 61
  9. 16
  10. 19
  11. 13
  12. 110
  13. 22
  14. 166
  15. 182
  16. 86
  17. 68
  18. 65
  19. 186
  20. 162
  21. 34
  22. 156
  23. 38
  24. 92
  25. 39
  26. 48
  27. 46
  28. 30
  29. 102
  30. 44
  31. 142
  32. 71
  33. 52
  34. 80
  35. 192
  36. 198
  37. 60
  38. 172
  39. 86
  40. 42

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