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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 748 · 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 58 =
  2. 2.Half of 48 =
  3. 3.Half of 154 =
  4. 4.Double 34 =
  5. 5.Double 99 =
  6. 6.Double 87 =
  7. 7.Half of 136 =
  8. 8.Double 71 =
  9. 9.Double 85 =
  10. 10.Half of 78 =
  11. 11.Half of 130 =
  12. 12.Half of 94 =
  13. 13.Double 78 =
  14. 14.Double 61 =
  15. 15.Half of 186 =
  16. 16.Half of 34 =
  17. 17.Half of 74 =
  18. 18.Double 51 =
  19. 19.Double 66 =
  20. 20.Half of 112 =
  21. 21.Double 57 =
  22. 22.Double 77 =
  23. 23.Half of 70 =
  24. 24.Double 41 =
  25. 25.Half of 122 =
  26. 26.Double 35 =
  27. 27.Double 91 =
  28. 28.Double 67 =
  29. 29.Half of 36 =
  30. 30.Double 74 =
  31. 31.Half of 120 =
  32. 32.Double 27 =
  33. 33.Half of 96 =
  34. 34.Double 36 =
  35. 35.Double 45 =
  36. 36.Double 39 =
  37. 37.Half of 38 =
  38. 38.Double 98 =
  39. 39.Half of 152 =
  40. 40.Double 19 =

Answer key

  1. 29
  2. 24
  3. 77
  4. 68
  5. 198
  6. 174
  7. 68
  8. 142
  9. 170
  10. 39
  11. 65
  12. 47
  13. 156
  14. 122
  15. 93
  16. 17
  17. 37
  18. 102
  19. 132
  20. 56
  21. 114
  22. 154
  23. 35
  24. 82
  25. 61
  26. 70
  27. 182
  28. 134
  29. 18
  30. 148
  31. 60
  32. 54
  33. 48
  34. 72
  35. 90
  36. 78
  37. 19
  38. 196
  39. 76
  40. 38

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