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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 928 · 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 44 =
  2. 2.Double 35 =
  3. 3.Double 83 =
  4. 4.Double 72 =
  5. 5.Half of 32 =
  6. 6.Half of 170 =
  7. 7.Half of 152 =
  8. 8.Half of 36 =
  9. 9.Half of 116 =
  10. 10.Half of 28 =
  11. 11.Half of 168 =
  12. 12.Half of 62 =
  13. 13.Half of 64 =
  14. 14.Double 33 =
  15. 15.Double 71 =
  16. 16.Half of 100 =
  17. 17.Double 57 =
  18. 18.Half of 96 =
  19. 19.Double 17 =
  20. 20.Double 29 =
  21. 21.Half of 74 =
  22. 22.Half of 112 =
  23. 23.Half of 124 =
  24. 24.Half of 54 =
  25. 25.Double 18 =
  26. 26.Double 19 =
  27. 27.Half of 166 =
  28. 28.Half of 78 =
  29. 29.Double 56 =
  30. 30.Half of 144 =
  31. 31.Double 88 =
  32. 32.Half of 94 =
  33. 33.Double 89 =
  34. 34.Half of 120 =
  35. 35.Double 41 =
  36. 36.Double 67 =
  37. 37.Half of 66 =
  38. 38.Half of 136 =
  39. 39.Half of 198 =
  40. 40.Double 81 =

Answer key

  1. 22
  2. 70
  3. 166
  4. 144
  5. 16
  6. 85
  7. 76
  8. 18
  9. 58
  10. 14
  11. 84
  12. 31
  13. 32
  14. 66
  15. 142
  16. 50
  17. 114
  18. 48
  19. 34
  20. 58
  21. 37
  22. 56
  23. 62
  24. 27
  25. 36
  26. 38
  27. 83
  28. 39
  29. 112
  30. 72
  31. 176
  32. 47
  33. 178
  34. 60
  35. 82
  36. 134
  37. 33
  38. 68
  39. 99
  40. 162

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