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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 550 · 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 81 =
  2. 2.Double 55 =
  3. 3.Half of 36 =
  4. 4.Half of 48 =
  5. 5.Half of 108 =
  6. 6.Double 37 =
  7. 7.Half of 54 =
  8. 8.Double 36 =
  9. 9.Half of 66 =
  10. 10.Double 92 =
  11. 11.Half of 42 =
  12. 12.Half of 154 =
  13. 13.Half of 146 =
  14. 14.Double 85 =
  15. 15.Half of 70 =
  16. 16.Double 38 =
  17. 17.Double 71 =
  18. 18.Double 95 =
  19. 19.Half of 52 =
  20. 20.Double 34 =
  21. 21.Half of 188 =
  22. 22.Double 67 =
  23. 23.Double 63 =
  24. 24.Double 25 =
  25. 25.Half of 68 =
  26. 26.Double 72 =
  27. 27.Half of 134 =
  28. 28.Half of 144 =
  29. 29.Half of 194 =
  30. 30.Half of 132 =
  31. 31.Half of 136 =
  32. 32.Half of 172 =
  33. 33.Double 76 =
  34. 34.Double 78 =
  35. 35.Half of 96 =
  36. 36.Double 77 =
  37. 37.Half of 76 =
  38. 38.Double 96 =
  39. 39.Half of 94 =
  40. 40.Half of 138 =

Answer key

  1. 162
  2. 110
  3. 18
  4. 24
  5. 54
  6. 74
  7. 27
  8. 72
  9. 33
  10. 184
  11. 21
  12. 77
  13. 73
  14. 170
  15. 35
  16. 76
  17. 142
  18. 190
  19. 26
  20. 68
  21. 94
  22. 134
  23. 126
  24. 50
  25. 34
  26. 144
  27. 67
  28. 72
  29. 97
  30. 66
  31. 68
  32. 86
  33. 152
  34. 156
  35. 48
  36. 154
  37. 38
  38. 192
  39. 47
  40. 69

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