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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 960 · 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 136 =
  2. 2.Double 91 =
  3. 3.Half of 86 =
  4. 4.Half of 82 =
  5. 5.Half of 94 =
  6. 6.Double 47 =
  7. 7.Double 36 =
  8. 8.Half of 164 =
  9. 9.Double 51 =
  10. 10.Half of 50 =
  11. 11.Half of 96 =
  12. 12.Double 27 =
  13. 13.Half of 130 =
  14. 14.Double 89 =
  15. 15.Half of 156 =
  16. 16.Half of 40 =
  17. 17.Double 73 =
  18. 18.Double 75 =
  19. 19.Half of 66 =
  20. 20.Double 96 =
  21. 21.Half of 58 =
  22. 22.Half of 118 =
  23. 23.Half of 26 =
  24. 24.Double 46 =
  25. 25.Half of 142 =
  26. 26.Half of 152 =
  27. 27.Half of 98 =
  28. 28.Double 79 =
  29. 29.Double 92 =
  30. 30.Half of 38 =
  31. 31.Double 38 =
  32. 32.Double 99 =
  33. 33.Half of 70 =
  34. 34.Half of 46 =
  35. 35.Half of 72 =
  36. 36.Half of 188 =
  37. 37.Half of 132 =
  38. 38.Half of 120 =
  39. 39.Half of 48 =
  40. 40.Half of 126 =

Answer key

  1. 68
  2. 182
  3. 43
  4. 41
  5. 47
  6. 94
  7. 72
  8. 82
  9. 102
  10. 25
  11. 48
  12. 54
  13. 65
  14. 178
  15. 78
  16. 20
  17. 146
  18. 150
  19. 33
  20. 192
  21. 29
  22. 59
  23. 13
  24. 92
  25. 71
  26. 76
  27. 49
  28. 158
  29. 184
  30. 19
  31. 76
  32. 198
  33. 35
  34. 23
  35. 36
  36. 94
  37. 66
  38. 60
  39. 24
  40. 63

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