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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 573 · 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 188 =
  2. 2.Double 49 =
  3. 3.Double 52 =
  4. 4.Half of 186 =
  5. 5.Double 58 =
  6. 6.Half of 192 =
  7. 7.Double 39 =
  8. 8.Half of 150 =
  9. 9.Double 86 =
  10. 10.Half of 54 =
  11. 11.Double 88 =
  12. 12.Half of 100 =
  13. 13.Double 51 =
  14. 14.Double 83 =
  15. 15.Double 29 =
  16. 16.Half of 106 =
  17. 17.Double 85 =
  18. 18.Half of 82 =
  19. 19.Half of 196 =
  20. 20.Double 45 =
  21. 21.Half of 166 =
  22. 22.Double 44 =
  23. 23.Half of 144 =
  24. 24.Half of 128 =
  25. 25.Double 19 =
  26. 26.Double 67 =
  27. 27.Half of 62 =
  28. 28.Half of 90 =
  29. 29.Double 71 =
  30. 30.Half of 138 =
  31. 31.Double 24 =
  32. 32.Half of 112 =
  33. 33.Double 75 =
  34. 34.Half of 48 =
  35. 35.Half of 98 =
  36. 36.Double 57 =
  37. 37.Half of 88 =
  38. 38.Half of 184 =
  39. 39.Half of 86 =
  40. 40.Double 53 =

Answer key

  1. 94
  2. 98
  3. 104
  4. 93
  5. 116
  6. 96
  7. 78
  8. 75
  9. 172
  10. 27
  11. 176
  12. 50
  13. 102
  14. 166
  15. 58
  16. 53
  17. 170
  18. 41
  19. 98
  20. 90
  21. 83
  22. 88
  23. 72
  24. 64
  25. 38
  26. 134
  27. 31
  28. 45
  29. 142
  30. 69
  31. 48
  32. 56
  33. 150
  34. 24
  35. 49
  36. 114
  37. 44
  38. 92
  39. 43
  40. 106

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