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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 171 · 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 61 =
  2. 2.Half of 184 =
  3. 3.Double 74 =
  4. 4.Double 58 =
  5. 5.Double 66 =
  6. 6.Half of 94 =
  7. 7.Double 57 =
  8. 8.Half of 80 =
  9. 9.Half of 158 =
  10. 10.Double 18 =
  11. 11.Double 68 =
  12. 12.Half of 44 =
  13. 13.Double 45 =
  14. 14.Double 42 =
  15. 15.Half of 128 =
  16. 16.Double 31 =
  17. 17.Double 34 =
  18. 18.Half of 108 =
  19. 19.Double 64 =
  20. 20.Half of 142 =
  21. 21.Double 38 =
  22. 22.Double 28 =
  23. 23.Double 78 =
  24. 24.Double 82 =
  25. 25.Half of 116 =
  26. 26.Double 63 =
  27. 27.Double 93 =
  28. 28.Double 47 =
  29. 29.Double 29 =
  30. 30.Double 91 =
  31. 31.Half of 70 =
  32. 32.Double 85 =
  33. 33.Half of 58 =
  34. 34.Double 73 =
  35. 35.Half of 74 =
  36. 36.Half of 104 =
  37. 37.Half of 42 =
  38. 38.Double 83 =
  39. 39.Half of 32 =
  40. 40.Half of 168 =

Answer key

  1. 122
  2. 92
  3. 148
  4. 116
  5. 132
  6. 47
  7. 114
  8. 40
  9. 79
  10. 36
  11. 136
  12. 22
  13. 90
  14. 84
  15. 64
  16. 62
  17. 68
  18. 54
  19. 128
  20. 71
  21. 76
  22. 56
  23. 156
  24. 164
  25. 58
  26. 126
  27. 186
  28. 94
  29. 58
  30. 182
  31. 35
  32. 170
  33. 29
  34. 146
  35. 37
  36. 52
  37. 21
  38. 166
  39. 16
  40. 84

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