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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 257 · 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 23 =
  2. 2.Half of 32 =
  3. 3.Half of 70 =
  4. 4.Half of 180 =
  5. 5.Half of 76 =
  6. 6.Half of 182 =
  7. 7.Double 48 =
  8. 8.Double 99 =
  9. 9.Double 21 =
  10. 10.Double 68 =
  11. 11.Double 62 =
  12. 12.Double 29 =
  13. 13.Half of 130 =
  14. 14.Half of 44 =
  15. 15.Half of 50 =
  16. 16.Double 81 =
  17. 17.Double 93 =
  18. 18.Double 61 =
  19. 19.Double 32 =
  20. 20.Double 36 =
  21. 21.Double 75 =
  22. 22.Half of 60 =
  23. 23.Double 89 =
  24. 24.Half of 114 =
  25. 25.Half of 144 =
  26. 26.Half of 46 =
  27. 27.Double 96 =
  28. 28.Half of 74 =
  29. 29.Half of 66 =
  30. 30.Half of 86 =
  31. 31.Double 94 =
  32. 32.Double 46 =
  33. 33.Half of 156 =
  34. 34.Half of 80 =
  35. 35.Double 56 =
  36. 36.Double 24 =
  37. 37.Half of 160 =
  38. 38.Half of 136 =
  39. 39.Double 26 =
  40. 40.Half of 158 =

Answer key

  1. 46
  2. 16
  3. 35
  4. 90
  5. 38
  6. 91
  7. 96
  8. 198
  9. 42
  10. 136
  11. 124
  12. 58
  13. 65
  14. 22
  15. 25
  16. 162
  17. 186
  18. 122
  19. 64
  20. 72
  21. 150
  22. 30
  23. 178
  24. 57
  25. 72
  26. 23
  27. 192
  28. 37
  29. 33
  30. 43
  31. 188
  32. 92
  33. 78
  34. 40
  35. 112
  36. 48
  37. 80
  38. 68
  39. 52
  40. 79

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