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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 99 · 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 38 =
  2. 2.Double 31 =
  3. 3.Half of 192 =
  4. 4.Double 82 =
  5. 5.Double 47 =
  6. 6.Double 96 =
  7. 7.Double 41 =
  8. 8.Double 29 =
  9. 9.Double 25 =
  10. 10.Double 59 =
  11. 11.Double 34 =
  12. 12.Double 81 =
  13. 13.Half of 112 =
  14. 14.Half of 68 =
  15. 15.Half of 86 =
  16. 16.Double 77 =
  17. 17.Half of 48 =
  18. 18.Half of 74 =
  19. 19.Half of 166 =
  20. 20.Half of 104 =
  21. 21.Double 26 =
  22. 22.Double 17 =
  23. 23.Half of 26 =
  24. 24.Double 55 =
  25. 25.Half of 72 =
  26. 26.Half of 60 =
  27. 27.Half of 146 =
  28. 28.Half of 160 =
  29. 29.Half of 188 =
  30. 30.Half of 152 =
  31. 31.Double 43 =
  32. 32.Double 51 =
  33. 33.Double 33 =
  34. 34.Double 83 =
  35. 35.Half of 194 =
  36. 36.Double 36 =
  37. 37.Double 66 =
  38. 38.Half of 58 =
  39. 39.Double 45 =
  40. 40.Half of 30 =

Answer key

  1. 76
  2. 62
  3. 96
  4. 164
  5. 94
  6. 192
  7. 82
  8. 58
  9. 50
  10. 118
  11. 68
  12. 162
  13. 56
  14. 34
  15. 43
  16. 154
  17. 24
  18. 37
  19. 83
  20. 52
  21. 52
  22. 34
  23. 13
  24. 110
  25. 36
  26. 30
  27. 73
  28. 80
  29. 94
  30. 76
  31. 86
  32. 102
  33. 66
  34. 166
  35. 97
  36. 72
  37. 132
  38. 29
  39. 90
  40. 15

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