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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 231 · 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 174 =
  2. 2.Half of 34 =
  3. 3.Half of 98 =
  4. 4.Double 75 =
  5. 5.Double 87 =
  6. 6.Half of 64 =
  7. 7.Half of 148 =
  8. 8.Half of 142 =
  9. 9.Double 61 =
  10. 10.Double 18 =
  11. 11.Double 48 =
  12. 12.Double 82 =
  13. 13.Double 17 =
  14. 14.Double 89 =
  15. 15.Double 64 =
  16. 16.Half of 50 =
  17. 17.Double 19 =
  18. 18.Double 72 =
  19. 19.Double 99 =
  20. 20.Double 37 =
  21. 21.Half of 96 =
  22. 22.Half of 172 =
  23. 23.Half of 70 =
  24. 24.Half of 120 =
  25. 25.Half of 164 =
  26. 26.Half of 130 =
  27. 27.Half of 152 =
  28. 28.Double 32 =
  29. 29.Half of 150 =
  30. 30.Double 38 =
  31. 31.Double 21 =
  32. 32.Double 25 =
  33. 33.Half of 110 =
  34. 34.Double 27 =
  35. 35.Double 58 =
  36. 36.Double 86 =
  37. 37.Double 83 =
  38. 38.Half of 108 =
  39. 39.Half of 40 =
  40. 40.Half of 48 =

Answer key

  1. 87
  2. 17
  3. 49
  4. 150
  5. 174
  6. 32
  7. 74
  8. 71
  9. 122
  10. 36
  11. 96
  12. 164
  13. 34
  14. 178
  15. 128
  16. 25
  17. 38
  18. 144
  19. 198
  20. 74
  21. 48
  22. 86
  23. 35
  24. 60
  25. 82
  26. 65
  27. 76
  28. 64
  29. 75
  30. 76
  31. 42
  32. 50
  33. 55
  34. 54
  35. 116
  36. 172
  37. 166
  38. 54
  39. 20
  40. 24

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