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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 25 · 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 58 =
  2. 2.Half of 102 =
  3. 3.Half of 50 =
  4. 4.Double 52 =
  5. 5.Double 97 =
  6. 6.Half of 164 =
  7. 7.Double 33 =
  8. 8.Half of 176 =
  9. 9.Double 71 =
  10. 10.Half of 84 =
  11. 11.Half of 114 =
  12. 12.Double 82 =
  13. 13.Half of 32 =
  14. 14.Half of 198 =
  15. 15.Half of 38 =
  16. 16.Double 64 =
  17. 17.Half of 170 =
  18. 18.Double 45 =
  19. 19.Half of 64 =
  20. 20.Double 23 =
  21. 21.Half of 130 =
  22. 22.Half of 60 =
  23. 23.Double 32 =
  24. 24.Double 79 =
  25. 25.Double 59 =
  26. 26.Double 18 =
  27. 27.Double 65 =
  28. 28.Double 31 =
  29. 29.Double 46 =
  30. 30.Double 41 =
  31. 31.Double 24 =
  32. 32.Double 77 =
  33. 33.Double 22 =
  34. 34.Double 86 =
  35. 35.Half of 54 =
  36. 36.Double 36 =
  37. 37.Half of 68 =
  38. 38.Double 89 =
  39. 39.Half of 194 =
  40. 40.Half of 142 =

Answer key

  1. 116
  2. 51
  3. 25
  4. 104
  5. 194
  6. 82
  7. 66
  8. 88
  9. 142
  10. 42
  11. 57
  12. 164
  13. 16
  14. 99
  15. 19
  16. 128
  17. 85
  18. 90
  19. 32
  20. 46
  21. 65
  22. 30
  23. 64
  24. 158
  25. 118
  26. 36
  27. 130
  28. 62
  29. 92
  30. 82
  31. 48
  32. 154
  33. 44
  34. 172
  35. 27
  36. 72
  37. 34
  38. 178
  39. 97
  40. 71

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