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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 127 · 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 36 =
  2. 2.Double 19 =
  3. 3.Double 22 =
  4. 4.Double 43 =
  5. 5.Half of 72 =
  6. 6.Half of 166 =
  7. 7.Double 96 =
  8. 8.Half of 88 =
  9. 9.Half of 46 =
  10. 10.Double 88 =
  11. 11.Half of 134 =
  12. 12.Double 41 =
  13. 13.Half of 44 =
  14. 14.Double 71 =
  15. 15.Half of 32 =
  16. 16.Double 99 =
  17. 17.Double 84 =
  18. 18.Half of 118 =
  19. 19.Half of 126 =
  20. 20.Double 58 =
  21. 21.Half of 180 =
  22. 22.Half of 84 =
  23. 23.Double 91 =
  24. 24.Half of 98 =
  25. 25.Half of 168 =
  26. 26.Double 23 =
  27. 27.Half of 30 =
  28. 28.Half of 108 =
  29. 29.Half of 136 =
  30. 30.Half of 34 =
  31. 31.Double 31 =
  32. 32.Double 92 =
  33. 33.Half of 116 =
  34. 34.Double 37 =
  35. 35.Double 66 =
  36. 36.Half of 130 =
  37. 37.Half of 62 =
  38. 38.Double 54 =
  39. 39.Half of 192 =
  40. 40.Double 79 =

Answer key

  1. 18
  2. 38
  3. 44
  4. 86
  5. 36
  6. 83
  7. 192
  8. 44
  9. 23
  10. 176
  11. 67
  12. 82
  13. 22
  14. 142
  15. 16
  16. 198
  17. 168
  18. 59
  19. 63
  20. 116
  21. 90
  22. 42
  23. 182
  24. 49
  25. 84
  26. 46
  27. 15
  28. 54
  29. 68
  30. 17
  31. 62
  32. 184
  33. 58
  34. 74
  35. 132
  36. 65
  37. 31
  38. 108
  39. 96
  40. 158

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