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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 516 · 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 82 =
  2. 2.Double 48 =
  3. 3.Half of 126 =
  4. 4.Half of 172 =
  5. 5.Double 53 =
  6. 6.Double 99 =
  7. 7.Half of 152 =
  8. 8.Double 33 =
  9. 9.Double 51 =
  10. 10.Double 81 =
  11. 11.Half of 62 =
  12. 12.Double 77 =
  13. 13.Double 27 =
  14. 14.Half of 32 =
  15. 15.Double 98 =
  16. 16.Double 29 =
  17. 17.Double 25 =
  18. 18.Half of 66 =
  19. 19.Half of 90 =
  20. 20.Double 36 =
  21. 21.Half of 136 =
  22. 22.Double 78 =
  23. 23.Half of 54 =
  24. 24.Double 21 =
  25. 25.Half of 196 =
  26. 26.Half of 128 =
  27. 27.Double 67 =
  28. 28.Double 69 =
  29. 29.Double 75 =
  30. 30.Half of 30 =
  31. 31.Half of 40 =
  32. 32.Half of 174 =
  33. 33.Double 39 =
  34. 34.Half of 82 =
  35. 35.Double 49 =
  36. 36.Half of 68 =
  37. 37.Half of 178 =
  38. 38.Half of 122 =
  39. 39.Double 47 =
  40. 40.Double 83 =

Answer key

  1. 164
  2. 96
  3. 63
  4. 86
  5. 106
  6. 198
  7. 76
  8. 66
  9. 102
  10. 162
  11. 31
  12. 154
  13. 54
  14. 16
  15. 196
  16. 58
  17. 50
  18. 33
  19. 45
  20. 72
  21. 68
  22. 156
  23. 27
  24. 42
  25. 98
  26. 64
  27. 134
  28. 138
  29. 150
  30. 15
  31. 20
  32. 87
  33. 78
  34. 41
  35. 98
  36. 34
  37. 89
  38. 61
  39. 94
  40. 166

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