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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 935 · 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 25 =
  2. 2.Double 56 =
  3. 3.Half of 110 =
  4. 4.Double 89 =
  5. 5.Half of 100 =
  6. 6.Double 41 =
  7. 7.Half of 198 =
  8. 8.Half of 74 =
  9. 9.Half of 154 =
  10. 10.Double 86 =
  11. 11.Double 26 =
  12. 12.Double 49 =
  13. 13.Double 35 =
  14. 14.Half of 98 =
  15. 15.Half of 166 =
  16. 16.Half of 36 =
  17. 17.Double 84 =
  18. 18.Double 82 =
  19. 19.Half of 188 =
  20. 20.Half of 84 =
  21. 21.Double 91 =
  22. 22.Double 47 =
  23. 23.Double 79 =
  24. 24.Double 22 =
  25. 25.Half of 60 =
  26. 26.Half of 58 =
  27. 27.Half of 30 =
  28. 28.Half of 160 =
  29. 29.Double 17 =
  30. 30.Double 64 =
  31. 31.Half of 96 =
  32. 32.Half of 182 =
  33. 33.Half of 54 =
  34. 34.Double 66 =
  35. 35.Half of 120 =
  36. 36.Double 21 =
  37. 37.Half of 122 =
  38. 38.Double 54 =
  39. 39.Half of 140 =
  40. 40.Half of 168 =

Answer key

  1. 50
  2. 112
  3. 55
  4. 178
  5. 50
  6. 82
  7. 99
  8. 37
  9. 77
  10. 172
  11. 52
  12. 98
  13. 70
  14. 49
  15. 83
  16. 18
  17. 168
  18. 164
  19. 94
  20. 42
  21. 182
  22. 94
  23. 158
  24. 44
  25. 30
  26. 29
  27. 15
  28. 80
  29. 34
  30. 128
  31. 48
  32. 91
  33. 27
  34. 132
  35. 60
  36. 42
  37. 61
  38. 108
  39. 70
  40. 84

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