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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 638 · 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 74 =
  3. 3.Half of 146 =
  4. 4.Double 61 =
  5. 5.Double 74 =
  6. 6.Half of 118 =
  7. 7.Double 95 =
  8. 8.Half of 90 =
  9. 9.Double 75 =
  10. 10.Half of 160 =
  11. 11.Double 85 =
  12. 12.Double 43 =
  13. 13.Half of 50 =
  14. 14.Double 31 =
  15. 15.Half of 66 =
  16. 16.Half of 60 =
  17. 17.Half of 76 =
  18. 18.Half of 132 =
  19. 19.Double 89 =
  20. 20.Half of 48 =
  21. 21.Half of 68 =
  22. 22.Double 99 =
  23. 23.Half of 34 =
  24. 24.Double 36 =
  25. 25.Double 78 =
  26. 26.Half of 112 =
  27. 27.Half of 32 =
  28. 28.Double 23 =
  29. 29.Double 83 =
  30. 30.Double 97 =
  31. 31.Double 84 =
  32. 32.Half of 116 =
  33. 33.Double 94 =
  34. 34.Double 54 =
  35. 35.Double 93 =
  36. 36.Double 71 =
  37. 37.Half of 188 =
  38. 38.Double 49 =
  39. 39.Half of 78 =
  40. 40.Half of 174 =

Answer key

  1. 88
  2. 37
  3. 73
  4. 122
  5. 148
  6. 59
  7. 190
  8. 45
  9. 150
  10. 80
  11. 170
  12. 86
  13. 25
  14. 62
  15. 33
  16. 30
  17. 38
  18. 66
  19. 178
  20. 24
  21. 34
  22. 198
  23. 17
  24. 72
  25. 156
  26. 56
  27. 16
  28. 46
  29. 166
  30. 194
  31. 168
  32. 58
  33. 188
  34. 108
  35. 186
  36. 142
  37. 94
  38. 98
  39. 39
  40. 87

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