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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 250 · 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 176 =
  2. 2.Half of 136 =
  3. 3.Half of 66 =
  4. 4.Half of 62 =
  5. 5.Double 95 =
  6. 6.Double 77 =
  7. 7.Double 66 =
  8. 8.Half of 86 =
  9. 9.Double 65 =
  10. 10.Half of 122 =
  11. 11.Half of 36 =
  12. 12.Half of 100 =
  13. 13.Double 26 =
  14. 14.Double 59 =
  15. 15.Half of 132 =
  16. 16.Half of 114 =
  17. 17.Double 61 =
  18. 18.Double 18 =
  19. 19.Half of 98 =
  20. 20.Half of 134 =
  21. 21.Double 36 =
  22. 22.Double 34 =
  23. 23.Half of 84 =
  24. 24.Half of 106 =
  25. 25.Half of 192 =
  26. 26.Half of 48 =
  27. 27.Half of 40 =
  28. 28.Double 81 =
  29. 29.Half of 112 =
  30. 30.Half of 138 =
  31. 31.Double 31 =
  32. 32.Double 76 =
  33. 33.Double 55 =
  34. 34.Double 69 =
  35. 35.Double 58 =
  36. 36.Double 74 =
  37. 37.Half of 28 =
  38. 38.Double 85 =
  39. 39.Double 89 =
  40. 40.Half of 130 =

Answer key

  1. 88
  2. 68
  3. 33
  4. 31
  5. 190
  6. 154
  7. 132
  8. 43
  9. 130
  10. 61
  11. 18
  12. 50
  13. 52
  14. 118
  15. 66
  16. 57
  17. 122
  18. 36
  19. 49
  20. 67
  21. 72
  22. 68
  23. 42
  24. 53
  25. 96
  26. 24
  27. 20
  28. 162
  29. 56
  30. 69
  31. 62
  32. 152
  33. 110
  34. 138
  35. 116
  36. 148
  37. 14
  38. 170
  39. 178
  40. 65

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