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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 994 · 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 90 =
  2. 2.Half of 152 =
  3. 3.Half of 42 =
  4. 4.Double 42 =
  5. 5.Double 69 =
  6. 6.Half of 26 =
  7. 7.Double 83 =
  8. 8.Double 81 =
  9. 9.Double 19 =
  10. 10.Double 28 =
  11. 11.Double 86 =
  12. 12.Half of 174 =
  13. 13.Double 79 =
  14. 14.Double 37 =
  15. 15.Half of 52 =
  16. 16.Double 89 =
  17. 17.Double 82 =
  18. 18.Half of 194 =
  19. 19.Double 47 =
  20. 20.Double 76 =
  21. 21.Double 51 =
  22. 22.Double 93 =
  23. 23.Double 97 =
  24. 24.Half of 180 =
  25. 25.Double 31 =
  26. 26.Half of 38 =
  27. 27.Half of 34 =
  28. 28.Half of 106 =
  29. 29.Double 44 =
  30. 30.Double 71 =
  31. 31.Half of 46 =
  32. 32.Double 33 =
  33. 33.Double 61 =
  34. 34.Double 96 =
  35. 35.Half of 58 =
  36. 36.Double 26 =
  37. 37.Double 65 =
  38. 38.Double 77 =
  39. 39.Double 39 =
  40. 40.Double 52 =

Answer key

  1. 45
  2. 76
  3. 21
  4. 84
  5. 138
  6. 13
  7. 166
  8. 162
  9. 38
  10. 56
  11. 172
  12. 87
  13. 158
  14. 74
  15. 26
  16. 178
  17. 164
  18. 97
  19. 94
  20. 152
  21. 102
  22. 186
  23. 194
  24. 90
  25. 62
  26. 19
  27. 17
  28. 53
  29. 88
  30. 142
  31. 23
  32. 66
  33. 122
  34. 192
  35. 29
  36. 52
  37. 130
  38. 154
  39. 78
  40. 104

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