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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 687 · 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 71 =
  2. 2.Double 37 =
  3. 3.Double 47 =
  4. 4.Half of 110 =
  5. 5.Double 88 =
  6. 6.Half of 184 =
  7. 7.Half of 66 =
  8. 8.Double 61 =
  9. 9.Double 35 =
  10. 10.Half of 68 =
  11. 11.Double 96 =
  12. 12.Double 41 =
  13. 13.Double 29 =
  14. 14.Half of 122 =
  15. 15.Double 27 =
  16. 16.Half of 54 =
  17. 17.Double 28 =
  18. 18.Double 76 =
  19. 19.Half of 36 =
  20. 20.Half of 56 =
  21. 21.Double 99 =
  22. 22.Double 72 =
  23. 23.Double 39 =
  24. 24.Half of 154 =
  25. 25.Double 26 =
  26. 26.Double 79 =
  27. 27.Half of 128 =
  28. 28.Half of 140 =
  29. 29.Half of 136 =
  30. 30.Half of 114 =
  31. 31.Double 32 =
  32. 32.Half of 168 =
  33. 33.Double 33 =
  34. 34.Double 63 =
  35. 35.Half of 180 =
  36. 36.Half of 176 =
  37. 37.Double 98 =
  38. 38.Half of 50 =
  39. 39.Half of 158 =
  40. 40.Double 22 =

Answer key

  1. 142
  2. 74
  3. 94
  4. 55
  5. 176
  6. 92
  7. 33
  8. 122
  9. 70
  10. 34
  11. 192
  12. 82
  13. 58
  14. 61
  15. 54
  16. 27
  17. 56
  18. 152
  19. 18
  20. 28
  21. 198
  22. 144
  23. 78
  24. 77
  25. 52
  26. 158
  27. 64
  28. 70
  29. 68
  30. 57
  31. 64
  32. 84
  33. 66
  34. 126
  35. 90
  36. 88
  37. 196
  38. 25
  39. 79
  40. 44

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