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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 41 · 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 27 =
  2. 2.Double 52 =
  3. 3.Half of 38 =
  4. 4.Half of 144 =
  5. 5.Half of 186 =
  6. 6.Double 76 =
  7. 7.Double 96 =
  8. 8.Half of 146 =
  9. 9.Double 99 =
  10. 10.Double 61 =
  11. 11.Double 56 =
  12. 12.Double 29 =
  13. 13.Double 91 =
  14. 14.Half of 190 =
  15. 15.Double 55 =
  16. 16.Double 78 =
  17. 17.Double 18 =
  18. 18.Double 58 =
  19. 19.Half of 118 =
  20. 20.Half of 76 =
  21. 21.Half of 116 =
  22. 22.Half of 134 =
  23. 23.Double 51 =
  24. 24.Double 42 =
  25. 25.Double 31 =
  26. 26.Half of 60 =
  27. 27.Double 95 =
  28. 28.Double 34 =
  29. 29.Double 62 =
  30. 30.Half of 54 =
  31. 31.Half of 130 =
  32. 32.Double 17 =
  33. 33.Half of 124 =
  34. 34.Half of 162 =
  35. 35.Half of 42 =
  36. 36.Double 35 =
  37. 37.Half of 58 =
  38. 38.Half of 172 =
  39. 39.Double 94 =
  40. 40.Double 45 =

Answer key

  1. 54
  2. 104
  3. 19
  4. 72
  5. 93
  6. 152
  7. 192
  8. 73
  9. 198
  10. 122
  11. 112
  12. 58
  13. 182
  14. 95
  15. 110
  16. 156
  17. 36
  18. 116
  19. 59
  20. 38
  21. 58
  22. 67
  23. 102
  24. 84
  25. 62
  26. 30
  27. 190
  28. 68
  29. 124
  30. 27
  31. 65
  32. 34
  33. 62
  34. 81
  35. 21
  36. 70
  37. 29
  38. 86
  39. 188
  40. 90

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