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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 319 · 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 95 =
  2. 2.Half of 134 =
  3. 3.Half of 92 =
  4. 4.Half of 168 =
  5. 5.Double 79 =
  6. 6.Double 64 =
  7. 7.Double 87 =
  8. 8.Double 23 =
  9. 9.Double 21 =
  10. 10.Double 99 =
  11. 11.Double 82 =
  12. 12.Half of 136 =
  13. 13.Double 16 =
  14. 14.Half of 146 =
  15. 15.Double 89 =
  16. 16.Half of 32 =
  17. 17.Double 25 =
  18. 18.Half of 48 =
  19. 19.Half of 98 =
  20. 20.Half of 44 =
  21. 21.Half of 118 =
  22. 22.Double 65 =
  23. 23.Half of 186 =
  24. 24.Double 39 =
  25. 25.Half of 78 =
  26. 26.Half of 152 =
  27. 27.Double 61 =
  28. 28.Double 34 =
  29. 29.Half of 120 =
  30. 30.Double 62 =
  31. 31.Half of 108 =
  32. 32.Half of 38 =
  33. 33.Half of 106 =
  34. 34.Double 91 =
  35. 35.Double 38 =
  36. 36.Double 31 =
  37. 37.Half of 62 =
  38. 38.Half of 82 =
  39. 39.Double 26 =
  40. 40.Half of 192 =

Answer key

  1. 190
  2. 67
  3. 46
  4. 84
  5. 158
  6. 128
  7. 174
  8. 46
  9. 42
  10. 198
  11. 164
  12. 68
  13. 32
  14. 73
  15. 178
  16. 16
  17. 50
  18. 24
  19. 49
  20. 22
  21. 59
  22. 130
  23. 93
  24. 78
  25. 39
  26. 76
  27. 122
  28. 68
  29. 60
  30. 124
  31. 54
  32. 19
  33. 53
  34. 182
  35. 76
  36. 62
  37. 31
  38. 41
  39. 52
  40. 96

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