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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 35 · 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 16 =
  2. 2.Double 71 =
  3. 3.Double 24 =
  4. 4.Double 63 =
  5. 5.Half of 160 =
  6. 6.Half of 62 =
  7. 7.Double 23 =
  8. 8.Double 76 =
  9. 9.Half of 88 =
  10. 10.Double 93 =
  11. 11.Double 27 =
  12. 12.Double 51 =
  13. 13.Double 67 =
  14. 14.Double 79 =
  15. 15.Half of 106 =
  16. 16.Half of 182 =
  17. 17.Half of 120 =
  18. 18.Half of 156 =
  19. 19.Double 77 =
  20. 20.Half of 72 =
  21. 21.Double 31 =
  22. 22.Half of 40 =
  23. 23.Half of 36 =
  24. 24.Half of 46 =
  25. 25.Double 61 =
  26. 26.Double 64 =
  27. 27.Double 78 =
  28. 28.Half of 56 =
  29. 29.Double 26 =
  30. 30.Half of 168 =
  31. 31.Double 81 =
  32. 32.Double 38 =
  33. 33.Half of 86 =
  34. 34.Half of 172 =
  35. 35.Double 41 =
  36. 36.Double 75 =
  37. 37.Double 17 =
  38. 38.Half of 118 =
  39. 39.Half of 130 =
  40. 40.Double 28 =

Answer key

  1. 32
  2. 142
  3. 48
  4. 126
  5. 80
  6. 31
  7. 46
  8. 152
  9. 44
  10. 186
  11. 54
  12. 102
  13. 134
  14. 158
  15. 53
  16. 91
  17. 60
  18. 78
  19. 154
  20. 36
  21. 62
  22. 20
  23. 18
  24. 23
  25. 122
  26. 128
  27. 156
  28. 28
  29. 52
  30. 84
  31. 162
  32. 76
  33. 43
  34. 86
  35. 82
  36. 150
  37. 34
  38. 59
  39. 65
  40. 56

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