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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 107 · 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 114 =
  2. 2.Half of 96 =
  3. 3.Double 39 =
  4. 4.Half of 162 =
  5. 5.Double 51 =
  6. 6.Double 81 =
  7. 7.Half of 126 =
  8. 8.Double 92 =
  9. 9.Double 53 =
  10. 10.Double 38 =
  11. 11.Half of 70 =
  12. 12.Half of 146 =
  13. 13.Double 93 =
  14. 14.Half of 90 =
  15. 15.Half of 62 =
  16. 16.Double 43 =
  17. 17.Half of 60 =
  18. 18.Double 86 =
  19. 19.Double 82 =
  20. 20.Half of 66 =
  21. 21.Half of 100 =
  22. 22.Double 25 =
  23. 23.Double 61 =
  24. 24.Half of 82 =
  25. 25.Double 56 =
  26. 26.Half of 120 =
  27. 27.Double 37 =
  28. 28.Half of 88 =
  29. 29.Half of 132 =
  30. 30.Double 65 =
  31. 31.Half of 180 =
  32. 32.Half of 46 =
  33. 33.Half of 48 =
  34. 34.Double 22 =
  35. 35.Half of 156 =
  36. 36.Double 72 =
  37. 37.Double 99 =
  38. 38.Half of 102 =
  39. 39.Double 57 =
  40. 40.Half of 84 =

Answer key

  1. 57
  2. 48
  3. 78
  4. 81
  5. 102
  6. 162
  7. 63
  8. 184
  9. 106
  10. 76
  11. 35
  12. 73
  13. 186
  14. 45
  15. 31
  16. 86
  17. 30
  18. 172
  19. 164
  20. 33
  21. 50
  22. 50
  23. 122
  24. 41
  25. 112
  26. 60
  27. 74
  28. 44
  29. 66
  30. 130
  31. 90
  32. 23
  33. 24
  34. 44
  35. 78
  36. 144
  37. 198
  38. 51
  39. 114
  40. 42

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