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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 768 · 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 64 =
  2. 2.Double 93 =
  3. 3.Half of 64 =
  4. 4.Double 91 =
  5. 5.Double 31 =
  6. 6.Half of 54 =
  7. 7.Half of 70 =
  8. 8.Half of 184 =
  9. 9.Double 23 =
  10. 10.Double 94 =
  11. 11.Half of 68 =
  12. 12.Half of 102 =
  13. 13.Double 43 =
  14. 14.Half of 112 =
  15. 15.Half of 34 =
  16. 16.Double 81 =
  17. 17.Double 95 =
  18. 18.Half of 136 =
  19. 19.Double 38 =
  20. 20.Double 79 =
  21. 21.Half of 52 =
  22. 22.Half of 42 =
  23. 23.Double 74 =
  24. 24.Double 16 =
  25. 25.Double 57 =
  26. 26.Half of 120 =
  27. 27.Half of 92 =
  28. 28.Half of 62 =
  29. 29.Double 75 =
  30. 30.Half of 60 =
  31. 31.Half of 152 =
  32. 32.Half of 114 =
  33. 33.Half of 182 =
  34. 34.Half of 132 =
  35. 35.Double 55 =
  36. 36.Half of 96 =
  37. 37.Double 77 =
  38. 38.Double 24 =
  39. 39.Half of 86 =
  40. 40.Half of 164 =

Answer key

  1. 128
  2. 186
  3. 32
  4. 182
  5. 62
  6. 27
  7. 35
  8. 92
  9. 46
  10. 188
  11. 34
  12. 51
  13. 86
  14. 56
  15. 17
  16. 162
  17. 190
  18. 68
  19. 76
  20. 158
  21. 26
  22. 21
  23. 148
  24. 32
  25. 114
  26. 60
  27. 46
  28. 31
  29. 150
  30. 30
  31. 76
  32. 57
  33. 91
  34. 66
  35. 110
  36. 48
  37. 154
  38. 48
  39. 43
  40. 82

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