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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 679 · 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 110 =
  2. 2.Double 52 =
  3. 3.Half of 78 =
  4. 4.Double 31 =
  5. 5.Half of 134 =
  6. 6.Double 39 =
  7. 7.Double 67 =
  8. 8.Half of 48 =
  9. 9.Half of 64 =
  10. 10.Half of 76 =
  11. 11.Half of 32 =
  12. 12.Half of 150 =
  13. 13.Half of 74 =
  14. 14.Half of 90 =
  15. 15.Half of 54 =
  16. 16.Half of 96 =
  17. 17.Double 42 =
  18. 18.Double 29 =
  19. 19.Half of 196 =
  20. 20.Double 62 =
  21. 21.Double 63 =
  22. 22.Double 84 =
  23. 23.Double 86 =
  24. 24.Half of 140 =
  25. 25.Half of 62 =
  26. 26.Double 41 =
  27. 27.Half of 148 =
  28. 28.Half of 120 =
  29. 29.Half of 116 =
  30. 30.Double 74 =
  31. 31.Half of 124 =
  32. 32.Double 54 =
  33. 33.Double 23 =
  34. 34.Half of 82 =
  35. 35.Half of 104 =
  36. 36.Double 27 =
  37. 37.Double 72 =
  38. 38.Double 61 =
  39. 39.Half of 72 =
  40. 40.Half of 138 =

Answer key

  1. 55
  2. 104
  3. 39
  4. 62
  5. 67
  6. 78
  7. 134
  8. 24
  9. 32
  10. 38
  11. 16
  12. 75
  13. 37
  14. 45
  15. 27
  16. 48
  17. 84
  18. 58
  19. 98
  20. 124
  21. 126
  22. 168
  23. 172
  24. 70
  25. 31
  26. 82
  27. 74
  28. 60
  29. 58
  30. 148
  31. 62
  32. 108
  33. 46
  34. 41
  35. 52
  36. 54
  37. 144
  38. 122
  39. 36
  40. 69

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