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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 147 · 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 91 =
  2. 2.Double 41 =
  3. 3.Half of 154 =
  4. 4.Double 67 =
  5. 5.Half of 124 =
  6. 6.Double 31 =
  7. 7.Half of 68 =
  8. 8.Double 25 =
  9. 9.Double 36 =
  10. 10.Half of 74 =
  11. 11.Half of 158 =
  12. 12.Half of 32 =
  13. 13.Double 59 =
  14. 14.Half of 62 =
  15. 15.Half of 34 =
  16. 16.Double 58 =
  17. 17.Double 65 =
  18. 18.Half of 136 =
  19. 19.Double 95 =
  20. 20.Half of 150 =
  21. 21.Double 38 =
  22. 22.Double 56 =
  23. 23.Double 99 =
  24. 24.Double 49 =
  25. 25.Half of 72 =
  26. 26.Half of 82 =
  27. 27.Double 66 =
  28. 28.Double 39 =
  29. 29.Double 23 =
  30. 30.Half of 122 =
  31. 31.Half of 100 =
  32. 32.Double 17 =
  33. 33.Half of 196 =
  34. 34.Double 72 =
  35. 35.Double 33 =
  36. 36.Double 61 =
  37. 37.Half of 186 =
  38. 38.Double 27 =
  39. 39.Double 21 =
  40. 40.Double 96 =

Answer key

  1. 182
  2. 82
  3. 77
  4. 134
  5. 62
  6. 62
  7. 34
  8. 50
  9. 72
  10. 37
  11. 79
  12. 16
  13. 118
  14. 31
  15. 17
  16. 116
  17. 130
  18. 68
  19. 190
  20. 75
  21. 76
  22. 112
  23. 198
  24. 98
  25. 36
  26. 41
  27. 132
  28. 78
  29. 46
  30. 61
  31. 50
  32. 34
  33. 98
  34. 144
  35. 66
  36. 122
  37. 93
  38. 54
  39. 42
  40. 192

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