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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 897 · 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 45 =
  2. 2.Double 24 =
  3. 3.Double 66 =
  4. 4.Double 71 =
  5. 5.Half of 44 =
  6. 6.Double 67 =
  7. 7.Half of 136 =
  8. 8.Double 78 =
  9. 9.Half of 30 =
  10. 10.Double 38 =
  11. 11.Double 44 =
  12. 12.Half of 32 =
  13. 13.Half of 154 =
  14. 14.Half of 38 =
  15. 15.Half of 104 =
  16. 16.Double 85 =
  17. 17.Half of 192 =
  18. 18.Half of 110 =
  19. 19.Double 41 =
  20. 20.Double 39 =
  21. 21.Double 88 =
  22. 22.Double 61 =
  23. 23.Half of 180 =
  24. 24.Double 54 =
  25. 25.Double 95 =
  26. 26.Half of 84 =
  27. 27.Double 81 =
  28. 28.Half of 120 =
  29. 29.Half of 50 =
  30. 30.Half of 98 =
  31. 31.Double 32 =
  32. 32.Half of 108 =
  33. 33.Half of 90 =
  34. 34.Half of 96 =
  35. 35.Double 52 =
  36. 36.Double 56 =
  37. 37.Double 65 =
  38. 38.Double 35 =
  39. 39.Double 63 =
  40. 40.Double 91 =

Answer key

  1. 90
  2. 48
  3. 132
  4. 142
  5. 22
  6. 134
  7. 68
  8. 156
  9. 15
  10. 76
  11. 88
  12. 16
  13. 77
  14. 19
  15. 52
  16. 170
  17. 96
  18. 55
  19. 82
  20. 78
  21. 176
  22. 122
  23. 90
  24. 108
  25. 190
  26. 42
  27. 162
  28. 60
  29. 25
  30. 49
  31. 64
  32. 54
  33. 45
  34. 48
  35. 104
  36. 112
  37. 130
  38. 70
  39. 126
  40. 182

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