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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 737 · 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 41 =
  2. 2.Double 37 =
  3. 3.Half of 100 =
  4. 4.Half of 84 =
  5. 5.Half of 64 =
  6. 6.Half of 128 =
  7. 7.Double 17 =
  8. 8.Double 93 =
  9. 9.Half of 156 =
  10. 10.Half of 126 =
  11. 11.Double 63 =
  12. 12.Double 45 =
  13. 13.Half of 54 =
  14. 14.Half of 160 =
  15. 15.Double 85 =
  16. 16.Double 84 =
  17. 17.Half of 82 =
  18. 18.Half of 174 =
  19. 19.Double 98 =
  20. 20.Half of 120 =
  21. 21.Half of 182 =
  22. 22.Half of 106 =
  23. 23.Double 55 =
  24. 24.Double 19 =
  25. 25.Double 46 =
  26. 26.Half of 102 =
  27. 27.Double 95 =
  28. 28.Double 65 =
  29. 29.Double 36 =
  30. 30.Half of 178 =
  31. 31.Double 21 =
  32. 32.Half of 134 =
  33. 33.Double 71 =
  34. 34.Double 82 =
  35. 35.Half of 62 =
  36. 36.Half of 92 =
  37. 37.Double 69 =
  38. 38.Double 87 =
  39. 39.Half of 198 =
  40. 40.Half of 140 =

Answer key

  1. 82
  2. 74
  3. 50
  4. 42
  5. 32
  6. 64
  7. 34
  8. 186
  9. 78
  10. 63
  11. 126
  12. 90
  13. 27
  14. 80
  15. 170
  16. 168
  17. 41
  18. 87
  19. 196
  20. 60
  21. 91
  22. 53
  23. 110
  24. 38
  25. 92
  26. 51
  27. 190
  28. 130
  29. 72
  30. 89
  31. 42
  32. 67
  33. 142
  34. 164
  35. 31
  36. 46
  37. 138
  38. 174
  39. 99
  40. 70

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