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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 885 · 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 128 =
  2. 2.Double 89 =
  3. 3.Half of 144 =
  4. 4.Half of 26 =
  5. 5.Half of 60 =
  6. 6.Half of 122 =
  7. 7.Double 92 =
  8. 8.Double 54 =
  9. 9.Double 22 =
  10. 10.Half of 72 =
  11. 11.Double 95 =
  12. 12.Double 33 =
  13. 13.Double 19 =
  14. 14.Double 16 =
  15. 15.Half of 188 =
  16. 16.Half of 124 =
  17. 17.Half of 180 =
  18. 18.Double 55 =
  19. 19.Half of 146 =
  20. 20.Half of 58 =
  21. 21.Half of 174 =
  22. 22.Half of 66 =
  23. 23.Half of 74 =
  24. 24.Double 34 =
  25. 25.Half of 106 =
  26. 26.Double 59 =
  27. 27.Half of 104 =
  28. 28.Double 21 =
  29. 29.Half of 100 =
  30. 30.Double 46 =
  31. 31.Double 44 =
  32. 32.Half of 88 =
  33. 33.Double 85 =
  34. 34.Half of 38 =
  35. 35.Half of 36 =
  36. 36.Double 39 =
  37. 37.Double 51 =
  38. 38.Double 78 =
  39. 39.Half of 30 =
  40. 40.Half of 98 =

Answer key

  1. 64
  2. 178
  3. 72
  4. 13
  5. 30
  6. 61
  7. 184
  8. 108
  9. 44
  10. 36
  11. 190
  12. 66
  13. 38
  14. 32
  15. 94
  16. 62
  17. 90
  18. 110
  19. 73
  20. 29
  21. 87
  22. 33
  23. 37
  24. 68
  25. 53
  26. 118
  27. 52
  28. 42
  29. 50
  30. 92
  31. 88
  32. 44
  33. 170
  34. 19
  35. 18
  36. 78
  37. 102
  38. 156
  39. 15
  40. 49

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