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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 525 · 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 16 =
  2. 2.Half of 158 =
  3. 3.Half of 174 =
  4. 4.Half of 32 =
  5. 5.Half of 110 =
  6. 6.Half of 134 =
  7. 7.Half of 82 =
  8. 8.Half of 156 =
  9. 9.Double 25 =
  10. 10.Double 79 =
  11. 11.Half of 114 =
  12. 12.Double 82 =
  13. 13.Double 61 =
  14. 14.Half of 30 =
  15. 15.Double 41 =
  16. 16.Double 91 =
  17. 17.Double 84 =
  18. 18.Half of 88 =
  19. 19.Double 56 =
  20. 20.Double 87 =
  21. 21.Double 21 =
  22. 22.Half of 64 =
  23. 23.Half of 120 =
  24. 24.Half of 90 =
  25. 25.Double 53 =
  26. 26.Double 72 =
  27. 27.Double 54 =
  28. 28.Double 64 =
  29. 29.Half of 126 =
  30. 30.Half of 172 =
  31. 31.Double 35 =
  32. 32.Half of 42 =
  33. 33.Double 95 =
  34. 34.Double 17 =
  35. 35.Double 75 =
  36. 36.Double 34 =
  37. 37.Double 36 =
  38. 38.Double 23 =
  39. 39.Half of 34 =
  40. 40.Half of 54 =

Answer key

  1. 32
  2. 79
  3. 87
  4. 16
  5. 55
  6. 67
  7. 41
  8. 78
  9. 50
  10. 158
  11. 57
  12. 164
  13. 122
  14. 15
  15. 82
  16. 182
  17. 168
  18. 44
  19. 112
  20. 174
  21. 42
  22. 32
  23. 60
  24. 45
  25. 106
  26. 144
  27. 108
  28. 128
  29. 63
  30. 86
  31. 70
  32. 21
  33. 190
  34. 34
  35. 150
  36. 68
  37. 72
  38. 46
  39. 17
  40. 27

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