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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 734 · 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 48 =
  2. 2.Double 17 =
  3. 3.Half of 176 =
  4. 4.Double 23 =
  5. 5.Half of 80 =
  6. 6.Half of 178 =
  7. 7.Double 75 =
  8. 8.Double 43 =
  9. 9.Double 53 =
  10. 10.Half of 28 =
  11. 11.Half of 52 =
  12. 12.Double 22 =
  13. 13.Double 61 =
  14. 14.Half of 132 =
  15. 15.Half of 86 =
  16. 16.Double 71 =
  17. 17.Half of 188 =
  18. 18.Half of 138 =
  19. 19.Double 85 =
  20. 20.Half of 70 =
  21. 21.Half of 114 =
  22. 22.Double 21 =
  23. 23.Double 51 =
  24. 24.Half of 150 =
  25. 25.Half of 112 =
  26. 26.Half of 46 =
  27. 27.Double 92 =
  28. 28.Half of 140 =
  29. 29.Double 57 =
  30. 30.Double 65 =
  31. 31.Double 26 =
  32. 32.Half of 60 =
  33. 33.Double 74 =
  34. 34.Double 32 =
  35. 35.Half of 66 =
  36. 36.Double 81 =
  37. 37.Half of 136 =
  38. 38.Half of 96 =
  39. 39.Half of 50 =
  40. 40.Double 83 =

Answer key

  1. 24
  2. 34
  3. 88
  4. 46
  5. 40
  6. 89
  7. 150
  8. 86
  9. 106
  10. 14
  11. 26
  12. 44
  13. 122
  14. 66
  15. 43
  16. 142
  17. 94
  18. 69
  19. 170
  20. 35
  21. 57
  22. 42
  23. 102
  24. 75
  25. 56
  26. 23
  27. 184
  28. 70
  29. 114
  30. 130
  31. 52
  32. 30
  33. 148
  34. 64
  35. 33
  36. 162
  37. 68
  38. 48
  39. 25
  40. 166

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