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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 56 · 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 90 =
  2. 2.Double 22 =
  3. 3.Double 82 =
  4. 4.Half of 190 =
  5. 5.Double 27 =
  6. 6.Double 21 =
  7. 7.Double 95 =
  8. 8.Half of 174 =
  9. 9.Double 35 =
  10. 10.Half of 72 =
  11. 11.Double 53 =
  12. 12.Half of 126 =
  13. 13.Double 58 =
  14. 14.Half of 44 =
  15. 15.Half of 34 =
  16. 16.Half of 172 =
  17. 17.Half of 180 =
  18. 18.Half of 186 =
  19. 19.Half of 198 =
  20. 20.Half of 28 =
  21. 21.Double 88 =
  22. 22.Half of 66 =
  23. 23.Double 16 =
  24. 24.Half of 130 =
  25. 25.Double 32 =
  26. 26.Half of 114 =
  27. 27.Double 89 =
  28. 28.Double 28 =
  29. 29.Half of 146 =
  30. 30.Half of 94 =
  31. 31.Double 79 =
  32. 32.Half of 182 =
  33. 33.Half of 120 =
  34. 34.Half of 116 =
  35. 35.Half of 134 =
  36. 36.Double 41 =
  37. 37.Half of 158 =
  38. 38.Half of 82 =
  39. 39.Half of 76 =
  40. 40.Double 51 =

Answer key

  1. 45
  2. 44
  3. 164
  4. 95
  5. 54
  6. 42
  7. 190
  8. 87
  9. 70
  10. 36
  11. 106
  12. 63
  13. 116
  14. 22
  15. 17
  16. 86
  17. 90
  18. 93
  19. 99
  20. 14
  21. 176
  22. 33
  23. 32
  24. 65
  25. 64
  26. 57
  27. 178
  28. 56
  29. 73
  30. 47
  31. 158
  32. 91
  33. 60
  34. 58
  35. 67
  36. 82
  37. 79
  38. 41
  39. 38
  40. 102

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