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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 294 · 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 154 =
  2. 2.Double 42 =
  3. 3.Double 91 =
  4. 4.Half of 196 =
  5. 5.Double 61 =
  6. 6.Double 51 =
  7. 7.Double 71 =
  8. 8.Half of 110 =
  9. 9.Double 18 =
  10. 10.Double 34 =
  11. 11.Half of 142 =
  12. 12.Double 27 =
  13. 13.Double 24 =
  14. 14.Double 84 =
  15. 15.Double 82 =
  16. 16.Half of 146 =
  17. 17.Half of 32 =
  18. 18.Double 77 =
  19. 19.Half of 186 =
  20. 20.Half of 118 =
  21. 21.Double 98 =
  22. 22.Half of 44 =
  23. 23.Half of 72 =
  24. 24.Double 92 =
  25. 25.Double 83 =
  26. 26.Double 99 =
  27. 27.Double 21 =
  28. 28.Half of 156 =
  29. 29.Double 75 =
  30. 30.Half of 172 =
  31. 31.Double 38 =
  32. 32.Double 22 =
  33. 33.Half of 34 =
  34. 34.Half of 134 =
  35. 35.Half of 152 =
  36. 36.Half of 28 =
  37. 37.Half of 76 =
  38. 38.Double 76 =
  39. 39.Half of 138 =
  40. 40.Double 32 =

Answer key

  1. 77
  2. 84
  3. 182
  4. 98
  5. 122
  6. 102
  7. 142
  8. 55
  9. 36
  10. 68
  11. 71
  12. 54
  13. 48
  14. 168
  15. 164
  16. 73
  17. 16
  18. 154
  19. 93
  20. 59
  21. 196
  22. 22
  23. 36
  24. 184
  25. 166
  26. 198
  27. 42
  28. 78
  29. 150
  30. 86
  31. 76
  32. 44
  33. 17
  34. 67
  35. 76
  36. 14
  37. 38
  38. 152
  39. 69
  40. 64

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