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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 660 · 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 66 =
  2. 2.Half of 112 =
  3. 3.Double 36 =
  4. 4.Half of 82 =
  5. 5.Double 21 =
  6. 6.Half of 70 =
  7. 7.Double 98 =
  8. 8.Double 33 =
  9. 9.Double 91 =
  10. 10.Half of 108 =
  11. 11.Double 24 =
  12. 12.Half of 124 =
  13. 13.Half of 152 =
  14. 14.Double 54 =
  15. 15.Half of 44 =
  16. 16.Half of 172 =
  17. 17.Double 67 =
  18. 18.Half of 80 =
  19. 19.Double 74 =
  20. 20.Half of 142 =
  21. 21.Double 79 =
  22. 22.Half of 136 =
  23. 23.Double 31 =
  24. 24.Double 42 =
  25. 25.Double 17 =
  26. 26.Double 78 =
  27. 27.Half of 48 =
  28. 28.Half of 176 =
  29. 29.Half of 34 =
  30. 30.Double 71 =
  31. 31.Double 51 =
  32. 32.Half of 106 =
  33. 33.Double 38 =
  34. 34.Double 16 =
  35. 35.Double 61 =
  36. 36.Double 96 =
  37. 37.Half of 56 =
  38. 38.Half of 118 =
  39. 39.Double 44 =
  40. 40.Double 52 =

Answer key

  1. 33
  2. 56
  3. 72
  4. 41
  5. 42
  6. 35
  7. 196
  8. 66
  9. 182
  10. 54
  11. 48
  12. 62
  13. 76
  14. 108
  15. 22
  16. 86
  17. 134
  18. 40
  19. 148
  20. 71
  21. 158
  22. 68
  23. 62
  24. 84
  25. 34
  26. 156
  27. 24
  28. 88
  29. 17
  30. 142
  31. 102
  32. 53
  33. 76
  34. 32
  35. 122
  36. 192
  37. 28
  38. 59
  39. 88
  40. 104

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