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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 547 · 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 43 =
  2. 2.Half of 96 =
  3. 3.Double 81 =
  4. 4.Double 73 =
  5. 5.Half of 106 =
  6. 6.Double 89 =
  7. 7.Half of 62 =
  8. 8.Half of 192 =
  9. 9.Double 34 =
  10. 10.Double 75 =
  11. 11.Double 26 =
  12. 12.Double 91 =
  13. 13.Double 54 =
  14. 14.Double 24 =
  15. 15.Double 71 =
  16. 16.Double 84 =
  17. 17.Half of 194 =
  18. 18.Half of 30 =
  19. 19.Half of 60 =
  20. 20.Double 69 =
  21. 21.Half of 128 =
  22. 22.Double 44 =
  23. 23.Half of 196 =
  24. 24.Half of 110 =
  25. 25.Double 18 =
  26. 26.Double 99 =
  27. 27.Double 85 =
  28. 28.Half of 98 =
  29. 29.Half of 44 =
  30. 30.Double 57 =
  31. 31.Double 39 =
  32. 32.Double 32 =
  33. 33.Half of 162 =
  34. 34.Double 31 =
  35. 35.Double 59 =
  36. 36.Double 82 =
  37. 37.Double 62 =
  38. 38.Double 23 =
  39. 39.Double 68 =
  40. 40.Double 97 =

Answer key

  1. 86
  2. 48
  3. 162
  4. 146
  5. 53
  6. 178
  7. 31
  8. 96
  9. 68
  10. 150
  11. 52
  12. 182
  13. 108
  14. 48
  15. 142
  16. 168
  17. 97
  18. 15
  19. 30
  20. 138
  21. 64
  22. 88
  23. 98
  24. 55
  25. 36
  26. 198
  27. 170
  28. 49
  29. 22
  30. 114
  31. 78
  32. 64
  33. 81
  34. 62
  35. 118
  36. 164
  37. 124
  38. 46
  39. 136
  40. 194

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