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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 860 · 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 100 =
  2. 2.Double 76 =
  3. 3.Double 98 =
  4. 4.Double 77 =
  5. 5.Half of 78 =
  6. 6.Half of 88 =
  7. 7.Double 66 =
  8. 8.Double 45 =
  9. 9.Half of 164 =
  10. 10.Double 54 =
  11. 11.Half of 114 =
  12. 12.Half of 60 =
  13. 13.Half of 166 =
  14. 14.Double 81 =
  15. 15.Double 17 =
  16. 16.Half of 74 =
  17. 17.Double 84 =
  18. 18.Half of 106 =
  19. 19.Half of 120 =
  20. 20.Double 19 =
  21. 21.Double 21 =
  22. 22.Double 78 =
  23. 23.Half of 148 =
  24. 24.Double 62 =
  25. 25.Double 71 =
  26. 26.Double 26 =
  27. 27.Half of 136 =
  28. 28.Double 28 =
  29. 29.Double 22 =
  30. 30.Half of 174 =
  31. 31.Double 44 =
  32. 32.Half of 108 =
  33. 33.Half of 138 =
  34. 34.Half of 178 =
  35. 35.Half of 58 =
  36. 36.Double 93 =
  37. 37.Half of 26 =
  38. 38.Half of 46 =
  39. 39.Half of 176 =
  40. 40.Double 61 =

Answer key

  1. 50
  2. 152
  3. 196
  4. 154
  5. 39
  6. 44
  7. 132
  8. 90
  9. 82
  10. 108
  11. 57
  12. 30
  13. 83
  14. 162
  15. 34
  16. 37
  17. 168
  18. 53
  19. 60
  20. 38
  21. 42
  22. 156
  23. 74
  24. 124
  25. 142
  26. 52
  27. 68
  28. 56
  29. 44
  30. 87
  31. 88
  32. 54
  33. 69
  34. 89
  35. 29
  36. 186
  37. 13
  38. 23
  39. 88
  40. 122

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