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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 156 · 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 99 =
  2. 2.Double 45 =
  3. 3.Double 83 =
  4. 4.Half of 72 =
  5. 5.Double 23 =
  6. 6.Double 81 =
  7. 7.Half of 44 =
  8. 8.Double 22 =
  9. 9.Double 65 =
  10. 10.Half of 124 =
  11. 11.Half of 106 =
  12. 12.Half of 46 =
  13. 13.Double 72 =
  14. 14.Half of 50 =
  15. 15.Double 92 =
  16. 16.Half of 158 =
  17. 17.Double 46 =
  18. 18.Double 36 =
  19. 19.Double 24 =
  20. 20.Double 47 =
  21. 21.Half of 140 =
  22. 22.Double 79 =
  23. 23.Double 52 =
  24. 24.Double 69 =
  25. 25.Half of 90 =
  26. 26.Double 38 =
  27. 27.Half of 74 =
  28. 28.Double 85 =
  29. 29.Double 26 =
  30. 30.Half of 132 =
  31. 31.Double 89 =
  32. 32.Double 27 =
  33. 33.Double 57 =
  34. 34.Half of 168 =
  35. 35.Half of 62 =
  36. 36.Half of 54 =
  37. 37.Double 93 =
  38. 38.Half of 38 =
  39. 39.Half of 48 =
  40. 40.Half of 174 =

Answer key

  1. 198
  2. 90
  3. 166
  4. 36
  5. 46
  6. 162
  7. 22
  8. 44
  9. 130
  10. 62
  11. 53
  12. 23
  13. 144
  14. 25
  15. 184
  16. 79
  17. 92
  18. 72
  19. 48
  20. 94
  21. 70
  22. 158
  23. 104
  24. 138
  25. 45
  26. 76
  27. 37
  28. 170
  29. 52
  30. 66
  31. 178
  32. 54
  33. 114
  34. 84
  35. 31
  36. 27
  37. 186
  38. 19
  39. 24
  40. 87

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