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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 963 · 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 33 =
  2. 2.Double 85 =
  3. 3.Double 32 =
  4. 4.Double 36 =
  5. 5.Double 81 =
  6. 6.Half of 84 =
  7. 7.Half of 106 =
  8. 8.Double 37 =
  9. 9.Half of 164 =
  10. 10.Double 22 =
  11. 11.Half of 74 =
  12. 12.Half of 70 =
  13. 13.Double 27 =
  14. 14.Half of 28 =
  15. 15.Double 49 =
  16. 16.Double 53 =
  17. 17.Half of 40 =
  18. 18.Double 18 =
  19. 19.Double 77 =
  20. 20.Half of 198 =
  21. 21.Double 82 =
  22. 22.Half of 120 =
  23. 23.Half of 168 =
  24. 24.Double 86 =
  25. 25.Half of 42 =
  26. 26.Double 19 =
  27. 27.Double 73 =
  28. 28.Double 62 =
  29. 29.Double 31 =
  30. 30.Double 46 =
  31. 31.Double 99 =
  32. 32.Half of 104 =
  33. 33.Half of 136 =
  34. 34.Double 74 =
  35. 35.Double 25 =
  36. 36.Double 91 =
  37. 37.Double 41 =
  38. 38.Half of 150 =
  39. 39.Half of 36 =
  40. 40.Half of 130 =

Answer key

  1. 66
  2. 170
  3. 64
  4. 72
  5. 162
  6. 42
  7. 53
  8. 74
  9. 82
  10. 44
  11. 37
  12. 35
  13. 54
  14. 14
  15. 98
  16. 106
  17. 20
  18. 36
  19. 154
  20. 99
  21. 164
  22. 60
  23. 84
  24. 172
  25. 21
  26. 38
  27. 146
  28. 124
  29. 62
  30. 92
  31. 198
  32. 52
  33. 68
  34. 148
  35. 50
  36. 182
  37. 82
  38. 75
  39. 18
  40. 65

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