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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 966 · 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 45 =
  2. 2.Double 37 =
  3. 3.Half of 36 =
  4. 4.Double 36 =
  5. 5.Double 22 =
  6. 6.Half of 42 =
  7. 7.Double 71 =
  8. 8.Half of 124 =
  9. 9.Double 63 =
  10. 10.Double 17 =
  11. 11.Double 69 =
  12. 12.Double 61 =
  13. 13.Double 31 =
  14. 14.Double 21 =
  15. 15.Double 83 =
  16. 16.Half of 38 =
  17. 17.Half of 56 =
  18. 18.Half of 88 =
  19. 19.Double 84 =
  20. 20.Half of 40 =
  21. 21.Half of 182 =
  22. 22.Double 81 =
  23. 23.Half of 134 =
  24. 24.Double 92 =
  25. 25.Double 78 =
  26. 26.Half of 186 =
  27. 27.Double 19 =
  28. 28.Double 27 =
  29. 29.Double 39 =
  30. 30.Double 28 =
  31. 31.Half of 104 =
  32. 32.Half of 74 =
  33. 33.Half of 82 =
  34. 34.Double 59 =
  35. 35.Double 32 =
  36. 36.Half of 114 =
  37. 37.Double 82 =
  38. 38.Half of 184 =
  39. 39.Double 88 =
  40. 40.Double 44 =

Answer key

  1. 90
  2. 74
  3. 18
  4. 72
  5. 44
  6. 21
  7. 142
  8. 62
  9. 126
  10. 34
  11. 138
  12. 122
  13. 62
  14. 42
  15. 166
  16. 19
  17. 28
  18. 44
  19. 168
  20. 20
  21. 91
  22. 162
  23. 67
  24. 184
  25. 156
  26. 93
  27. 38
  28. 54
  29. 78
  30. 56
  31. 52
  32. 37
  33. 41
  34. 118
  35. 64
  36. 57
  37. 164
  38. 92
  39. 176
  40. 88

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