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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 747 · 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 93 =
  2. 2.Half of 30 =
  3. 3.Half of 160 =
  4. 4.Half of 28 =
  5. 5.Half of 68 =
  6. 6.Half of 94 =
  7. 7.Half of 122 =
  8. 8.Double 47 =
  9. 9.Double 89 =
  10. 10.Double 67 =
  11. 11.Half of 34 =
  12. 12.Half of 102 =
  13. 13.Half of 50 =
  14. 14.Double 29 =
  15. 15.Half of 84 =
  16. 16.Double 43 =
  17. 17.Double 61 =
  18. 18.Half of 128 =
  19. 19.Half of 118 =
  20. 20.Double 95 =
  21. 21.Half of 178 =
  22. 22.Double 27 =
  23. 23.Double 36 =
  24. 24.Half of 38 =
  25. 25.Double 41 =
  26. 26.Double 77 =
  27. 27.Double 52 =
  28. 28.Half of 64 =
  29. 29.Double 79 =
  30. 30.Half of 108 =
  31. 31.Double 42 =
  32. 32.Half of 58 =
  33. 33.Half of 158 =
  34. 34.Double 17 =
  35. 35.Half of 52 =
  36. 36.Double 34 =
  37. 37.Half of 32 =
  38. 38.Half of 148 =
  39. 39.Half of 162 =
  40. 40.Half of 164 =

Answer key

  1. 186
  2. 15
  3. 80
  4. 14
  5. 34
  6. 47
  7. 61
  8. 94
  9. 178
  10. 134
  11. 17
  12. 51
  13. 25
  14. 58
  15. 42
  16. 86
  17. 122
  18. 64
  19. 59
  20. 190
  21. 89
  22. 54
  23. 72
  24. 19
  25. 82
  26. 154
  27. 104
  28. 32
  29. 158
  30. 54
  31. 84
  32. 29
  33. 79
  34. 34
  35. 26
  36. 68
  37. 16
  38. 74
  39. 81
  40. 82

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