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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 969 · 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 120 =
  2. 2.Double 99 =
  3. 3.Half of 116 =
  4. 4.Double 89 =
  5. 5.Half of 50 =
  6. 6.Half of 66 =
  7. 7.Double 33 =
  8. 8.Double 93 =
  9. 9.Double 77 =
  10. 10.Half of 118 =
  11. 11.Double 67 =
  12. 12.Double 37 =
  13. 13.Double 28 =
  14. 14.Double 27 =
  15. 15.Half of 78 =
  16. 16.Half of 132 =
  17. 17.Double 21 =
  18. 18.Half of 82 =
  19. 19.Half of 190 =
  20. 20.Half of 38 =
  21. 21.Double 69 =
  22. 22.Double 66 =
  23. 23.Double 61 =
  24. 24.Double 71 =
  25. 25.Double 48 =
  26. 26.Half of 156 =
  27. 27.Half of 168 =
  28. 28.Half of 160 =
  29. 29.Half of 140 =
  30. 30.Half of 48 =
  31. 31.Half of 56 =
  32. 32.Half of 64 =
  33. 33.Half of 26 =
  34. 34.Double 23 =
  35. 35.Double 86 =
  36. 36.Half of 32 =
  37. 37.Double 17 =
  38. 38.Half of 174 =
  39. 39.Double 53 =
  40. 40.Double 98 =

Answer key

  1. 60
  2. 198
  3. 58
  4. 178
  5. 25
  6. 33
  7. 66
  8. 186
  9. 154
  10. 59
  11. 134
  12. 74
  13. 56
  14. 54
  15. 39
  16. 66
  17. 42
  18. 41
  19. 95
  20. 19
  21. 138
  22. 132
  23. 122
  24. 142
  25. 96
  26. 78
  27. 84
  28. 80
  29. 70
  30. 24
  31. 28
  32. 32
  33. 13
  34. 46
  35. 172
  36. 16
  37. 34
  38. 87
  39. 106
  40. 196

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