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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 230 · 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 150 =
  2. 2.Double 19 =
  3. 3.Double 33 =
  4. 4.Double 56 =
  5. 5.Double 65 =
  6. 6.Double 76 =
  7. 7.Half of 128 =
  8. 8.Half of 184 =
  9. 9.Half of 186 =
  10. 10.Double 69 =
  11. 11.Half of 106 =
  12. 12.Double 53 =
  13. 13.Half of 44 =
  14. 14.Double 39 =
  15. 15.Double 55 =
  16. 16.Double 57 =
  17. 17.Half of 26 =
  18. 18.Double 27 =
  19. 19.Double 85 =
  20. 20.Double 54 =
  21. 21.Half of 76 =
  22. 22.Double 99 =
  23. 23.Half of 118 =
  24. 24.Half of 54 =
  25. 25.Double 28 =
  26. 26.Half of 112 =
  27. 27.Half of 60 =
  28. 28.Half of 34 =
  29. 29.Half of 160 =
  30. 30.Double 82 =
  31. 31.Half of 82 =
  32. 32.Half of 154 =
  33. 33.Half of 58 =
  34. 34.Double 45 =
  35. 35.Double 36 =
  36. 36.Half of 148 =
  37. 37.Double 94 =
  38. 38.Half of 62 =
  39. 39.Double 26 =
  40. 40.Double 83 =

Answer key

  1. 75
  2. 38
  3. 66
  4. 112
  5. 130
  6. 152
  7. 64
  8. 92
  9. 93
  10. 138
  11. 53
  12. 106
  13. 22
  14. 78
  15. 110
  16. 114
  17. 13
  18. 54
  19. 170
  20. 108
  21. 38
  22. 198
  23. 59
  24. 27
  25. 56
  26. 56
  27. 30
  28. 17
  29. 80
  30. 164
  31. 41
  32. 77
  33. 29
  34. 90
  35. 72
  36. 74
  37. 188
  38. 31
  39. 52
  40. 166

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