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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 332 · 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 184 =
  2. 2.Half of 98 =
  3. 3.Half of 96 =
  4. 4.Double 78 =
  5. 5.Double 94 =
  6. 6.Half of 60 =
  7. 7.Double 75 =
  8. 8.Double 48 =
  9. 9.Half of 128 =
  10. 10.Half of 30 =
  11. 11.Half of 84 =
  12. 12.Half of 76 =
  13. 13.Half of 188 =
  14. 14.Double 61 =
  15. 15.Double 32 =
  16. 16.Double 23 =
  17. 17.Half of 86 =
  18. 18.Half of 48 =
  19. 19.Double 71 =
  20. 20.Half of 100 =
  21. 21.Half of 90 =
  22. 22.Double 18 =
  23. 23.Double 58 =
  24. 24.Half of 130 =
  25. 25.Double 41 =
  26. 26.Double 24 =
  27. 27.Half of 162 =
  28. 28.Half of 140 =
  29. 29.Double 19 =
  30. 30.Double 68 =
  31. 31.Double 91 =
  32. 32.Double 95 =
  33. 33.Double 46 =
  34. 34.Double 59 =
  35. 35.Double 69 =
  36. 36.Half of 142 =
  37. 37.Half of 42 =
  38. 38.Half of 38 =
  39. 39.Half of 150 =
  40. 40.Double 34 =

Answer key

  1. 92
  2. 49
  3. 48
  4. 156
  5. 188
  6. 30
  7. 150
  8. 96
  9. 64
  10. 15
  11. 42
  12. 38
  13. 94
  14. 122
  15. 64
  16. 46
  17. 43
  18. 24
  19. 142
  20. 50
  21. 45
  22. 36
  23. 116
  24. 65
  25. 82
  26. 48
  27. 81
  28. 70
  29. 38
  30. 136
  31. 182
  32. 190
  33. 92
  34. 118
  35. 138
  36. 71
  37. 21
  38. 19
  39. 75
  40. 68

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