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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 684 · 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 42 =
  2. 2.Double 31 =
  3. 3.Half of 56 =
  4. 4.Half of 28 =
  5. 5.Half of 182 =
  6. 6.Double 44 =
  7. 7.Half of 134 =
  8. 8.Half of 140 =
  9. 9.Half of 166 =
  10. 10.Half of 168 =
  11. 11.Half of 152 =
  12. 12.Double 36 =
  13. 13.Half of 50 =
  14. 14.Double 37 =
  15. 15.Half of 188 =
  16. 16.Half of 192 =
  17. 17.Double 24 =
  18. 18.Double 64 =
  19. 19.Half of 100 =
  20. 20.Double 78 =
  21. 21.Half of 48 =
  22. 22.Double 93 =
  23. 23.Half of 98 =
  24. 24.Half of 58 =
  25. 25.Double 25 =
  26. 26.Double 16 =
  27. 27.Double 88 =
  28. 28.Half of 106 =
  29. 29.Half of 66 =
  30. 30.Double 83 =
  31. 31.Half of 72 =
  32. 32.Half of 120 =
  33. 33.Half of 164 =
  34. 34.Double 65 =
  35. 35.Double 51 =
  36. 36.Half of 84 =
  37. 37.Half of 172 =
  38. 38.Double 45 =
  39. 39.Double 76 =
  40. 40.Half of 46 =

Answer key

  1. 84
  2. 62
  3. 28
  4. 14
  5. 91
  6. 88
  7. 67
  8. 70
  9. 83
  10. 84
  11. 76
  12. 72
  13. 25
  14. 74
  15. 94
  16. 96
  17. 48
  18. 128
  19. 50
  20. 156
  21. 24
  22. 186
  23. 49
  24. 29
  25. 50
  26. 32
  27. 176
  28. 53
  29. 33
  30. 166
  31. 36
  32. 60
  33. 82
  34. 130
  35. 102
  36. 42
  37. 86
  38. 90
  39. 152
  40. 23

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