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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 371 · 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.Half of 32 =
  2. 2.Half of 196 =
  3. 3.Double 51 =
  4. 4.Double 85 =
  5. 5.Half of 104 =
  6. 6.Half of 96 =
  7. 7.Half of 162 =
  8. 8.Half of 82 =
  9. 9.Double 55 =
  10. 10.Double 79 =
  11. 11.Double 19 =
  12. 12.Double 43 =
  13. 13.Half of 70 =
  14. 14.Half of 64 =
  15. 15.Half of 114 =
  16. 16.Double 56 =
  17. 17.Half of 156 =
  18. 18.Double 24 =
  19. 19.Half of 136 =
  20. 20.Double 18 =
  21. 21.Half of 148 =
  22. 22.Double 77 =
  23. 23.Half of 38 =
  24. 24.Half of 182 =
  25. 25.Double 16 =
  26. 26.Half of 176 =
  27. 27.Half of 122 =
  28. 28.Double 64 =
  29. 29.Double 76 =
  30. 30.Half of 174 =
  31. 31.Double 38 =
  32. 32.Double 83 =
  33. 33.Half of 34 =
  34. 34.Half of 48 =
  35. 35.Double 61 =
  36. 36.Half of 84 =
  37. 37.Double 29 =
  38. 38.Double 57 =
  39. 39.Half of 112 =
  40. 40.Double 82 =

Answer key

  1. 16
  2. 98
  3. 102
  4. 170
  5. 52
  6. 48
  7. 81
  8. 41
  9. 110
  10. 158
  11. 38
  12. 86
  13. 35
  14. 32
  15. 57
  16. 112
  17. 78
  18. 48
  19. 68
  20. 36
  21. 74
  22. 154
  23. 19
  24. 91
  25. 32
  26. 88
  27. 61
  28. 128
  29. 152
  30. 87
  31. 76
  32. 166
  33. 17
  34. 24
  35. 122
  36. 42
  37. 58
  38. 114
  39. 56
  40. 164

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