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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 30 · 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 57 =
  2. 2.Double 79 =
  3. 3.Double 73 =
  4. 4.Half of 184 =
  5. 5.Half of 152 =
  6. 6.Half of 82 =
  7. 7.Half of 98 =
  8. 8.Half of 156 =
  9. 9.Double 36 =
  10. 10.Double 28 =
  11. 11.Half of 60 =
  12. 12.Double 54 =
  13. 13.Half of 114 =
  14. 14.Double 34 =
  15. 15.Half of 84 =
  16. 16.Double 23 =
  17. 17.Double 72 =
  18. 18.Double 93 =
  19. 19.Double 69 =
  20. 20.Double 59 =
  21. 21.Half of 134 =
  22. 22.Double 99 =
  23. 23.Half of 120 =
  24. 24.Double 75 =
  25. 25.Double 45 =
  26. 26.Double 46 =
  27. 27.Half of 160 =
  28. 28.Half of 48 =
  29. 29.Half of 32 =
  30. 30.Half of 30 =
  31. 31.Double 94 =
  32. 32.Double 83 =
  33. 33.Double 52 =
  34. 34.Half of 124 =
  35. 35.Double 29 =
  36. 36.Half of 78 =
  37. 37.Double 87 =
  38. 38.Half of 62 =
  39. 39.Half of 128 =
  40. 40.Double 64 =

Answer key

  1. 114
  2. 158
  3. 146
  4. 92
  5. 76
  6. 41
  7. 49
  8. 78
  9. 72
  10. 56
  11. 30
  12. 108
  13. 57
  14. 68
  15. 42
  16. 46
  17. 144
  18. 186
  19. 138
  20. 118
  21. 67
  22. 198
  23. 60
  24. 150
  25. 90
  26. 92
  27. 80
  28. 24
  29. 16
  30. 15
  31. 188
  32. 166
  33. 104
  34. 62
  35. 58
  36. 39
  37. 174
  38. 31
  39. 64
  40. 128

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