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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 718 · 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 32 =
  2. 2.Half of 122 =
  3. 3.Half of 58 =
  4. 4.Double 76 =
  5. 5.Half of 84 =
  6. 6.Double 94 =
  7. 7.Half of 112 =
  8. 8.Double 36 =
  9. 9.Double 84 =
  10. 10.Half of 186 =
  11. 11.Half of 182 =
  12. 12.Double 87 =
  13. 13.Double 68 =
  14. 14.Half of 86 =
  15. 15.Double 31 =
  16. 16.Half of 162 =
  17. 17.Double 24 =
  18. 18.Double 45 =
  19. 19.Half of 156 =
  20. 20.Double 86 =
  21. 21.Double 21 =
  22. 22.Half of 110 =
  23. 23.Half of 82 =
  24. 24.Double 43 =
  25. 25.Half of 28 =
  26. 26.Half of 94 =
  27. 27.Half of 98 =
  28. 28.Double 61 =
  29. 29.Half of 126 =
  30. 30.Half of 38 =
  31. 31.Half of 48 =
  32. 32.Double 77 =
  33. 33.Double 71 =
  34. 34.Double 55 =
  35. 35.Half of 168 =
  36. 36.Double 89 =
  37. 37.Double 82 =
  38. 38.Half of 68 =
  39. 39.Half of 158 =
  40. 40.Half of 60 =

Answer key

  1. 16
  2. 61
  3. 29
  4. 152
  5. 42
  6. 188
  7. 56
  8. 72
  9. 168
  10. 93
  11. 91
  12. 174
  13. 136
  14. 43
  15. 62
  16. 81
  17. 48
  18. 90
  19. 78
  20. 172
  21. 42
  22. 55
  23. 41
  24. 86
  25. 14
  26. 47
  27. 49
  28. 122
  29. 63
  30. 19
  31. 24
  32. 154
  33. 142
  34. 110
  35. 84
  36. 178
  37. 164
  38. 34
  39. 79
  40. 30

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