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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 29 · 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 56 =
  2. 2.Half of 32 =
  3. 3.Half of 72 =
  4. 4.Half of 166 =
  5. 5.Half of 188 =
  6. 6.Half of 148 =
  7. 7.Double 75 =
  8. 8.Double 31 =
  9. 9.Half of 108 =
  10. 10.Half of 44 =
  11. 11.Half of 132 =
  12. 12.Half of 130 =
  13. 13.Double 77 =
  14. 14.Half of 102 =
  15. 15.Half of 162 =
  16. 16.Double 68 =
  17. 17.Double 62 =
  18. 18.Half of 128 =
  19. 19.Double 86 =
  20. 20.Double 19 =
  21. 21.Half of 92 =
  22. 22.Double 38 =
  23. 23.Half of 122 =
  24. 24.Double 65 =
  25. 25.Half of 100 =
  26. 26.Double 48 =
  27. 27.Half of 150 =
  28. 28.Half of 136 =
  29. 29.Half of 82 =
  30. 30.Half of 60 =
  31. 31.Double 78 =
  32. 32.Double 63 =
  33. 33.Double 28 =
  34. 34.Half of 142 =
  35. 35.Double 74 =
  36. 36.Double 96 =
  37. 37.Double 84 =
  38. 38.Double 64 =
  39. 39.Double 94 =
  40. 40.Double 41 =

Answer key

  1. 112
  2. 16
  3. 36
  4. 83
  5. 94
  6. 74
  7. 150
  8. 62
  9. 54
  10. 22
  11. 66
  12. 65
  13. 154
  14. 51
  15. 81
  16. 136
  17. 124
  18. 64
  19. 172
  20. 38
  21. 46
  22. 76
  23. 61
  24. 130
  25. 50
  26. 96
  27. 75
  28. 68
  29. 41
  30. 30
  31. 156
  32. 126
  33. 56
  34. 71
  35. 148
  36. 192
  37. 168
  38. 128
  39. 188
  40. 82

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