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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 866 · 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 26 =
  2. 2.Double 78 =
  3. 3.Double 23 =
  4. 4.Double 41 =
  5. 5.Double 31 =
  6. 6.Double 79 =
  7. 7.Double 85 =
  8. 8.Double 25 =
  9. 9.Double 45 =
  10. 10.Double 89 =
  11. 11.Double 21 =
  12. 12.Half of 82 =
  13. 13.Double 67 =
  14. 14.Half of 144 =
  15. 15.Double 96 =
  16. 16.Half of 192 =
  17. 17.Double 72 =
  18. 18.Double 17 =
  19. 19.Double 29 =
  20. 20.Double 76 =
  21. 21.Half of 42 =
  22. 22.Double 43 =
  23. 23.Half of 140 =
  24. 24.Double 52 =
  25. 25.Double 34 =
  26. 26.Half of 86 =
  27. 27.Double 19 =
  28. 28.Double 57 =
  29. 29.Double 73 =
  30. 30.Double 33 =
  31. 31.Half of 120 =
  32. 32.Half of 194 =
  33. 33.Half of 124 =
  34. 34.Double 71 =
  35. 35.Half of 68 =
  36. 36.Half of 190 =
  37. 37.Half of 90 =
  38. 38.Half of 72 =
  39. 39.Half of 30 =
  40. 40.Double 51 =

Answer key

  1. 13
  2. 156
  3. 46
  4. 82
  5. 62
  6. 158
  7. 170
  8. 50
  9. 90
  10. 178
  11. 42
  12. 41
  13. 134
  14. 72
  15. 192
  16. 96
  17. 144
  18. 34
  19. 58
  20. 152
  21. 21
  22. 86
  23. 70
  24. 104
  25. 68
  26. 43
  27. 38
  28. 114
  29. 146
  30. 66
  31. 60
  32. 97
  33. 62
  34. 142
  35. 34
  36. 95
  37. 45
  38. 36
  39. 15
  40. 102

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