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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 255 · 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 19 =
  2. 2.Half of 186 =
  3. 3.Double 38 =
  4. 4.Double 91 =
  5. 5.Double 16 =
  6. 6.Half of 180 =
  7. 7.Double 83 =
  8. 8.Half of 110 =
  9. 9.Half of 116 =
  10. 10.Double 92 =
  11. 11.Half of 72 =
  12. 12.Half of 46 =
  13. 13.Half of 188 =
  14. 14.Double 44 =
  15. 15.Half of 170 =
  16. 16.Half of 138 =
  17. 17.Double 39 =
  18. 18.Double 81 =
  19. 19.Half of 54 =
  20. 20.Double 77 =
  21. 21.Half of 114 =
  22. 22.Double 68 =
  23. 23.Double 37 =
  24. 24.Half of 52 =
  25. 25.Double 23 =
  26. 26.Double 47 =
  27. 27.Half of 140 =
  28. 28.Double 41 =
  29. 29.Half of 74 =
  30. 30.Half of 34 =
  31. 31.Half of 160 =
  32. 32.Double 86 =
  33. 33.Double 72 =
  34. 34.Half of 182 =
  35. 35.Double 24 =
  36. 36.Double 51 =
  37. 37.Half of 148 =
  38. 38.Half of 82 =
  39. 39.Half of 130 =
  40. 40.Double 54 =

Answer key

  1. 38
  2. 93
  3. 76
  4. 182
  5. 32
  6. 90
  7. 166
  8. 55
  9. 58
  10. 184
  11. 36
  12. 23
  13. 94
  14. 88
  15. 85
  16. 69
  17. 78
  18. 162
  19. 27
  20. 154
  21. 57
  22. 136
  23. 74
  24. 26
  25. 46
  26. 94
  27. 70
  28. 82
  29. 37
  30. 17
  31. 80
  32. 172
  33. 144
  34. 91
  35. 48
  36. 102
  37. 74
  38. 41
  39. 65
  40. 108

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