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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 82 · 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 23 =
  2. 2.Half of 62 =
  3. 3.Half of 110 =
  4. 4.Half of 106 =
  5. 5.Double 74 =
  6. 6.Half of 80 =
  7. 7.Double 46 =
  8. 8.Double 35 =
  9. 9.Double 71 =
  10. 10.Double 48 =
  11. 11.Half of 162 =
  12. 12.Half of 192 =
  13. 13.Half of 28 =
  14. 14.Half of 194 =
  15. 15.Double 86 =
  16. 16.Half of 74 =
  17. 17.Double 61 =
  18. 18.Double 32 =
  19. 19.Double 65 =
  20. 20.Half of 100 =
  21. 21.Double 85 =
  22. 22.Double 64 =
  23. 23.Double 21 =
  24. 24.Half of 36 =
  25. 25.Half of 178 =
  26. 26.Double 17 =
  27. 27.Double 51 =
  28. 28.Double 82 =
  29. 29.Double 56 =
  30. 30.Double 36 =
  31. 31.Half of 44 =
  32. 32.Half of 54 =
  33. 33.Half of 48 =
  34. 34.Half of 84 =
  35. 35.Double 39 =
  36. 36.Half of 150 =
  37. 37.Double 31 =
  38. 38.Double 42 =
  39. 39.Double 25 =
  40. 40.Double 63 =

Answer key

  1. 46
  2. 31
  3. 55
  4. 53
  5. 148
  6. 40
  7. 92
  8. 70
  9. 142
  10. 96
  11. 81
  12. 96
  13. 14
  14. 97
  15. 172
  16. 37
  17. 122
  18. 64
  19. 130
  20. 50
  21. 170
  22. 128
  23. 42
  24. 18
  25. 89
  26. 34
  27. 102
  28. 164
  29. 112
  30. 72
  31. 22
  32. 27
  33. 24
  34. 42
  35. 78
  36. 75
  37. 62
  38. 84
  39. 50
  40. 126

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