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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 238 · 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 48 =
  2. 2.Half of 118 =
  3. 3.Half of 176 =
  4. 4.Half of 168 =
  5. 5.Double 62 =
  6. 6.Double 46 =
  7. 7.Double 36 =
  8. 8.Double 72 =
  9. 9.Half of 100 =
  10. 10.Double 66 =
  11. 11.Half of 34 =
  12. 12.Half of 96 =
  13. 13.Half of 132 =
  14. 14.Half of 108 =
  15. 15.Half of 46 =
  16. 16.Double 57 =
  17. 17.Double 86 =
  18. 18.Half of 86 =
  19. 19.Double 74 =
  20. 20.Half of 74 =
  21. 21.Double 82 =
  22. 22.Half of 54 =
  23. 23.Half of 36 =
  24. 24.Half of 148 =
  25. 25.Half of 114 =
  26. 26.Double 64 =
  27. 27.Half of 194 =
  28. 28.Half of 192 =
  29. 29.Half of 92 =
  30. 30.Double 47 =
  31. 31.Double 25 =
  32. 32.Double 76 =
  33. 33.Double 81 =
  34. 34.Half of 28 =
  35. 35.Double 41 =
  36. 36.Half of 42 =
  37. 37.Double 39 =
  38. 38.Double 58 =
  39. 39.Double 61 =
  40. 40.Half of 88 =

Answer key

  1. 24
  2. 59
  3. 88
  4. 84
  5. 124
  6. 92
  7. 72
  8. 144
  9. 50
  10. 132
  11. 17
  12. 48
  13. 66
  14. 54
  15. 23
  16. 114
  17. 172
  18. 43
  19. 148
  20. 37
  21. 164
  22. 27
  23. 18
  24. 74
  25. 57
  26. 128
  27. 97
  28. 96
  29. 46
  30. 94
  31. 50
  32. 152
  33. 162
  34. 14
  35. 82
  36. 21
  37. 78
  38. 116
  39. 122
  40. 44

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