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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 132 · 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 52 =
  2. 2.Double 32 =
  3. 3.Double 42 =
  4. 4.Half of 114 =
  5. 5.Half of 28 =
  6. 6.Half of 60 =
  7. 7.Half of 100 =
  8. 8.Double 99 =
  9. 9.Double 71 =
  10. 10.Double 46 =
  11. 11.Double 27 =
  12. 12.Double 17 =
  13. 13.Double 84 =
  14. 14.Half of 90 =
  15. 15.Half of 150 =
  16. 16.Half of 48 =
  17. 17.Double 51 =
  18. 18.Half of 56 =
  19. 19.Double 41 =
  20. 20.Double 37 =
  21. 21.Half of 190 =
  22. 22.Double 77 =
  23. 23.Half of 36 =
  24. 24.Double 57 =
  25. 25.Double 73 =
  26. 26.Double 22 =
  27. 27.Double 25 =
  28. 28.Half of 96 =
  29. 29.Half of 156 =
  30. 30.Half of 158 =
  31. 31.Half of 178 =
  32. 32.Double 28 =
  33. 33.Half of 134 =
  34. 34.Half of 146 =
  35. 35.Half of 120 =
  36. 36.Double 61 =
  37. 37.Half of 188 =
  38. 38.Double 68 =
  39. 39.Double 91 =
  40. 40.Half of 102 =

Answer key

  1. 104
  2. 64
  3. 84
  4. 57
  5. 14
  6. 30
  7. 50
  8. 198
  9. 142
  10. 92
  11. 54
  12. 34
  13. 168
  14. 45
  15. 75
  16. 24
  17. 102
  18. 28
  19. 82
  20. 74
  21. 95
  22. 154
  23. 18
  24. 114
  25. 146
  26. 44
  27. 50
  28. 48
  29. 78
  30. 79
  31. 89
  32. 56
  33. 67
  34. 73
  35. 60
  36. 122
  37. 94
  38. 136
  39. 182
  40. 51

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