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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 73 · 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 182 =
  2. 2.Double 74 =
  3. 3.Double 66 =
  4. 4.Half of 92 =
  5. 5.Double 19 =
  6. 6.Half of 134 =
  7. 7.Half of 56 =
  8. 8.Double 51 =
  9. 9.Half of 68 =
  10. 10.Double 79 =
  11. 11.Half of 132 =
  12. 12.Double 55 =
  13. 13.Half of 122 =
  14. 14.Double 17 =
  15. 15.Double 97 =
  16. 16.Double 36 =
  17. 17.Double 59 =
  18. 18.Half of 150 =
  19. 19.Half of 28 =
  20. 20.Half of 48 =
  21. 21.Half of 40 =
  22. 22.Double 78 =
  23. 23.Half of 170 =
  24. 24.Half of 188 =
  25. 25.Double 31 =
  26. 26.Double 85 =
  27. 27.Half of 186 =
  28. 28.Double 71 =
  29. 29.Half of 168 =
  30. 30.Half of 130 =
  31. 31.Double 49 =
  32. 32.Half of 110 =
  33. 33.Half of 160 =
  34. 34.Half of 86 =
  35. 35.Double 48 =
  36. 36.Half of 154 =
  37. 37.Half of 36 =
  38. 38.Double 91 =
  39. 39.Half of 82 =
  40. 40.Half of 136 =

Answer key

  1. 91
  2. 148
  3. 132
  4. 46
  5. 38
  6. 67
  7. 28
  8. 102
  9. 34
  10. 158
  11. 66
  12. 110
  13. 61
  14. 34
  15. 194
  16. 72
  17. 118
  18. 75
  19. 14
  20. 24
  21. 20
  22. 156
  23. 85
  24. 94
  25. 62
  26. 170
  27. 93
  28. 142
  29. 84
  30. 65
  31. 98
  32. 55
  33. 80
  34. 43
  35. 96
  36. 77
  37. 18
  38. 182
  39. 41
  40. 68

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