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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 524 · 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 39 =
  2. 2.Half of 108 =
  3. 3.Double 91 =
  4. 4.Half of 122 =
  5. 5.Half of 36 =
  6. 6.Half of 68 =
  7. 7.Double 34 =
  8. 8.Double 61 =
  9. 9.Half of 144 =
  10. 10.Double 32 =
  11. 11.Half of 170 =
  12. 12.Half of 38 =
  13. 13.Half of 166 =
  14. 14.Double 43 =
  15. 15.Double 71 =
  16. 16.Double 72 =
  17. 17.Double 78 =
  18. 18.Double 95 =
  19. 19.Half of 70 =
  20. 20.Double 59 =
  21. 21.Half of 146 =
  22. 22.Double 24 =
  23. 23.Half of 86 =
  24. 24.Half of 182 =
  25. 25.Half of 118 =
  26. 26.Double 29 =
  27. 27.Half of 130 =
  28. 28.Double 66 =
  29. 29.Double 54 =
  30. 30.Half of 120 =
  31. 31.Half of 176 =
  32. 32.Half of 174 =
  33. 33.Double 94 =
  34. 34.Double 47 =
  35. 35.Half of 154 =
  36. 36.Double 99 =
  37. 37.Double 85 =
  38. 38.Half of 40 =
  39. 39.Half of 178 =
  40. 40.Half of 198 =

Answer key

  1. 78
  2. 54
  3. 182
  4. 61
  5. 18
  6. 34
  7. 68
  8. 122
  9. 72
  10. 64
  11. 85
  12. 19
  13. 83
  14. 86
  15. 142
  16. 144
  17. 156
  18. 190
  19. 35
  20. 118
  21. 73
  22. 48
  23. 43
  24. 91
  25. 59
  26. 58
  27. 65
  28. 132
  29. 108
  30. 60
  31. 88
  32. 87
  33. 188
  34. 94
  35. 77
  36. 198
  37. 170
  38. 20
  39. 89
  40. 99

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