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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 974 · 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 46 =
  2. 2.Half of 140 =
  3. 3.Double 36 =
  4. 4.Double 82 =
  5. 5.Double 57 =
  6. 6.Half of 36 =
  7. 7.Half of 150 =
  8. 8.Half of 70 =
  9. 9.Double 38 =
  10. 10.Half of 132 =
  11. 11.Double 78 =
  12. 12.Half of 84 =
  13. 13.Double 47 =
  14. 14.Double 29 =
  15. 15.Half of 78 =
  16. 16.Double 87 =
  17. 17.Double 86 =
  18. 18.Half of 50 =
  19. 19.Half of 88 =
  20. 20.Double 71 =
  21. 21.Half of 138 =
  22. 22.Half of 58 =
  23. 23.Double 98 =
  24. 24.Double 41 =
  25. 25.Double 31 =
  26. 26.Double 63 =
  27. 27.Half of 110 =
  28. 28.Double 67 =
  29. 29.Double 92 =
  30. 30.Half of 96 =
  31. 31.Double 44 =
  32. 32.Double 83 =
  33. 33.Double 43 =
  34. 34.Half of 30 =
  35. 35.Half of 174 =
  36. 36.Double 53 =
  37. 37.Half of 74 =
  38. 38.Half of 156 =
  39. 39.Double 62 =
  40. 40.Double 34 =

Answer key

  1. 23
  2. 70
  3. 72
  4. 164
  5. 114
  6. 18
  7. 75
  8. 35
  9. 76
  10. 66
  11. 156
  12. 42
  13. 94
  14. 58
  15. 39
  16. 174
  17. 172
  18. 25
  19. 44
  20. 142
  21. 69
  22. 29
  23. 196
  24. 82
  25. 62
  26. 126
  27. 55
  28. 134
  29. 184
  30. 48
  31. 88
  32. 166
  33. 86
  34. 15
  35. 87
  36. 106
  37. 37
  38. 78
  39. 124
  40. 68

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