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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 133 · 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 65 =
  2. 2.Half of 54 =
  3. 3.Half of 126 =
  4. 4.Double 77 =
  5. 5.Double 66 =
  6. 6.Double 53 =
  7. 7.Half of 76 =
  8. 8.Double 67 =
  9. 9.Double 61 =
  10. 10.Half of 118 =
  11. 11.Half of 38 =
  12. 12.Half of 138 =
  13. 13.Double 21 =
  14. 14.Double 23 =
  15. 15.Double 26 =
  16. 16.Double 42 =
  17. 17.Double 46 =
  18. 18.Half of 86 =
  19. 19.Half of 144 =
  20. 20.Half of 196 =
  21. 21.Half of 36 =
  22. 22.Double 24 =
  23. 23.Double 31 =
  24. 24.Double 81 =
  25. 25.Half of 178 =
  26. 26.Double 68 =
  27. 27.Double 29 =
  28. 28.Half of 108 =
  29. 29.Half of 98 =
  30. 30.Double 45 =
  31. 31.Double 25 =
  32. 32.Double 71 =
  33. 33.Double 39 =
  34. 34.Double 49 =
  35. 35.Double 27 =
  36. 36.Half of 192 =
  37. 37.Half of 164 =
  38. 38.Half of 100 =
  39. 39.Half of 194 =
  40. 40.Double 82 =

Answer key

  1. 130
  2. 27
  3. 63
  4. 154
  5. 132
  6. 106
  7. 38
  8. 134
  9. 122
  10. 59
  11. 19
  12. 69
  13. 42
  14. 46
  15. 52
  16. 84
  17. 92
  18. 43
  19. 72
  20. 98
  21. 18
  22. 48
  23. 62
  24. 162
  25. 89
  26. 136
  27. 58
  28. 54
  29. 49
  30. 90
  31. 50
  32. 142
  33. 78
  34. 98
  35. 54
  36. 96
  37. 82
  38. 50
  39. 97
  40. 164

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