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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 923 · 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 87 =
  2. 2.Double 61 =
  3. 3.Double 39 =
  4. 4.Half of 180 =
  5. 5.Half of 56 =
  6. 6.Half of 100 =
  7. 7.Half of 82 =
  8. 8.Half of 192 =
  9. 9.Double 64 =
  10. 10.Double 36 =
  11. 11.Half of 38 =
  12. 12.Half of 122 =
  13. 13.Half of 64 =
  14. 14.Half of 162 =
  15. 15.Half of 76 =
  16. 16.Double 77 =
  17. 17.Double 49 =
  18. 18.Double 32 =
  19. 19.Half of 84 =
  20. 20.Half of 134 =
  21. 21.Double 54 =
  22. 22.Half of 66 =
  23. 23.Double 71 =
  24. 24.Half of 138 =
  25. 25.Half of 34 =
  26. 26.Double 31 =
  27. 27.Double 72 =
  28. 28.Double 48 =
  29. 29.Double 24 =
  30. 30.Half of 168 =
  31. 31.Double 37 =
  32. 32.Double 82 =
  33. 33.Double 35 =
  34. 34.Double 38 =
  35. 35.Double 62 =
  36. 36.Half of 194 =
  37. 37.Half of 60 =
  38. 38.Half of 118 =
  39. 39.Half of 176 =
  40. 40.Double 21 =

Answer key

  1. 174
  2. 122
  3. 78
  4. 90
  5. 28
  6. 50
  7. 41
  8. 96
  9. 128
  10. 72
  11. 19
  12. 61
  13. 32
  14. 81
  15. 38
  16. 154
  17. 98
  18. 64
  19. 42
  20. 67
  21. 108
  22. 33
  23. 142
  24. 69
  25. 17
  26. 62
  27. 144
  28. 96
  29. 48
  30. 84
  31. 74
  32. 164
  33. 70
  34. 76
  35. 124
  36. 97
  37. 30
  38. 59
  39. 88
  40. 42

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