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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 202 · 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 57 =
  2. 2.Half of 128 =
  3. 3.Half of 90 =
  4. 4.Double 69 =
  5. 5.Double 39 =
  6. 6.Double 31 =
  7. 7.Half of 36 =
  8. 8.Double 61 =
  9. 9.Half of 52 =
  10. 10.Half of 78 =
  11. 11.Half of 170 =
  12. 12.Double 45 =
  13. 13.Half of 134 =
  14. 14.Double 54 =
  15. 15.Half of 164 =
  16. 16.Double 92 =
  17. 17.Half of 40 =
  18. 18.Half of 44 =
  19. 19.Double 81 =
  20. 20.Double 88 =
  21. 21.Half of 84 =
  22. 22.Double 46 =
  23. 23.Half of 58 =
  24. 24.Double 83 =
  25. 25.Double 52 =
  26. 26.Half of 80 =
  27. 27.Double 37 =
  28. 28.Half of 152 =
  29. 29.Half of 148 =
  30. 30.Double 74 =
  31. 31.Half of 28 =
  32. 32.Half of 118 =
  33. 33.Double 53 =
  34. 34.Double 77 =
  35. 35.Half of 62 =
  36. 36.Half of 178 =
  37. 37.Double 59 =
  38. 38.Double 78 =
  39. 39.Half of 166 =
  40. 40.Double 72 =

Answer key

  1. 114
  2. 64
  3. 45
  4. 138
  5. 78
  6. 62
  7. 18
  8. 122
  9. 26
  10. 39
  11. 85
  12. 90
  13. 67
  14. 108
  15. 82
  16. 184
  17. 20
  18. 22
  19. 162
  20. 176
  21. 42
  22. 92
  23. 29
  24. 166
  25. 104
  26. 40
  27. 74
  28. 76
  29. 74
  30. 148
  31. 14
  32. 59
  33. 106
  34. 154
  35. 31
  36. 89
  37. 118
  38. 156
  39. 83
  40. 144

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