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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 9 · 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 186 =
  2. 2.Double 34 =
  3. 3.Half of 172 =
  4. 4.Half of 166 =
  5. 5.Half of 54 =
  6. 6.Half of 144 =
  7. 7.Half of 58 =
  8. 8.Double 93 =
  9. 9.Double 85 =
  10. 10.Half of 82 =
  11. 11.Double 75 =
  12. 12.Half of 94 =
  13. 13.Double 91 =
  14. 14.Double 18 =
  15. 15.Double 43 =
  16. 16.Double 61 =
  17. 17.Double 25 =
  18. 18.Double 23 =
  19. 19.Half of 60 =
  20. 20.Half of 178 =
  21. 21.Half of 86 =
  22. 22.Half of 162 =
  23. 23.Half of 56 =
  24. 24.Half of 190 =
  25. 25.Double 86 =
  26. 26.Half of 102 =
  27. 27.Double 26 =
  28. 28.Double 71 =
  29. 29.Half of 146 =
  30. 30.Double 54 =
  31. 31.Half of 96 =
  32. 32.Double 44 =
  33. 33.Half of 112 =
  34. 34.Half of 158 =
  35. 35.Double 33 =
  36. 36.Double 59 =
  37. 37.Half of 50 =
  38. 38.Half of 28 =
  39. 39.Half of 100 =
  40. 40.Double 28 =

Answer key

  1. 93
  2. 68
  3. 86
  4. 83
  5. 27
  6. 72
  7. 29
  8. 186
  9. 170
  10. 41
  11. 150
  12. 47
  13. 182
  14. 36
  15. 86
  16. 122
  17. 50
  18. 46
  19. 30
  20. 89
  21. 43
  22. 81
  23. 28
  24. 95
  25. 172
  26. 51
  27. 52
  28. 142
  29. 73
  30. 108
  31. 48
  32. 88
  33. 56
  34. 79
  35. 66
  36. 118
  37. 25
  38. 14
  39. 50
  40. 56

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