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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 604 · 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 68 =
  2. 2.Double 69 =
  3. 3.Half of 74 =
  4. 4.Half of 122 =
  5. 5.Double 92 =
  6. 6.Double 64 =
  7. 7.Half of 184 =
  8. 8.Half of 52 =
  9. 9.Double 57 =
  10. 10.Half of 192 =
  11. 11.Half of 82 =
  12. 12.Double 18 =
  13. 13.Double 58 =
  14. 14.Double 51 =
  15. 15.Double 61 =
  16. 16.Half of 44 =
  17. 17.Half of 42 =
  18. 18.Double 47 =
  19. 19.Double 93 =
  20. 20.Double 41 =
  21. 21.Half of 132 =
  22. 22.Half of 48 =
  23. 23.Half of 168 =
  24. 24.Half of 158 =
  25. 25.Half of 108 =
  26. 26.Half of 94 =
  27. 27.Half of 140 =
  28. 28.Double 23 =
  29. 29.Double 17 =
  30. 30.Half of 66 =
  31. 31.Double 19 =
  32. 32.Half of 190 =
  33. 33.Half of 62 =
  34. 34.Double 35 =
  35. 35.Double 49 =
  36. 36.Half of 106 =
  37. 37.Double 89 =
  38. 38.Double 55 =
  39. 39.Double 84 =
  40. 40.Double 71 =

Answer key

  1. 136
  2. 138
  3. 37
  4. 61
  5. 184
  6. 128
  7. 92
  8. 26
  9. 114
  10. 96
  11. 41
  12. 36
  13. 116
  14. 102
  15. 122
  16. 22
  17. 21
  18. 94
  19. 186
  20. 82
  21. 66
  22. 24
  23. 84
  24. 79
  25. 54
  26. 47
  27. 70
  28. 46
  29. 34
  30. 33
  31. 38
  32. 95
  33. 31
  34. 70
  35. 98
  36. 53
  37. 178
  38. 110
  39. 168
  40. 142

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