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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 774 · 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 128 =
  2. 2.Half of 144 =
  3. 3.Half of 120 =
  4. 4.Half of 68 =
  5. 5.Half of 40 =
  6. 6.Double 57 =
  7. 7.Double 92 =
  8. 8.Half of 84 =
  9. 9.Double 76 =
  10. 10.Half of 110 =
  11. 11.Half of 66 =
  12. 12.Double 51 =
  13. 13.Half of 72 =
  14. 14.Double 74 =
  15. 15.Double 61 =
  16. 16.Half of 28 =
  17. 17.Double 83 =
  18. 18.Double 33 =
  19. 19.Half of 112 =
  20. 20.Double 46 =
  21. 21.Half of 42 =
  22. 22.Double 73 =
  23. 23.Half of 182 =
  24. 24.Double 25 =
  25. 25.Double 91 =
  26. 26.Half of 46 =
  27. 27.Half of 142 =
  28. 28.Double 63 =
  29. 29.Double 31 =
  30. 30.Double 86 =
  31. 31.Double 67 =
  32. 32.Double 85 =
  33. 33.Double 69 =
  34. 34.Double 21 =
  35. 35.Half of 60 =
  36. 36.Double 71 =
  37. 37.Half of 30 =
  38. 38.Half of 170 =
  39. 39.Double 96 =
  40. 40.Double 44 =

Answer key

  1. 64
  2. 72
  3. 60
  4. 34
  5. 20
  6. 114
  7. 184
  8. 42
  9. 152
  10. 55
  11. 33
  12. 102
  13. 36
  14. 148
  15. 122
  16. 14
  17. 166
  18. 66
  19. 56
  20. 92
  21. 21
  22. 146
  23. 91
  24. 50
  25. 182
  26. 23
  27. 71
  28. 126
  29. 62
  30. 172
  31. 134
  32. 170
  33. 138
  34. 42
  35. 30
  36. 142
  37. 15
  38. 85
  39. 192
  40. 88

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