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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 563 · 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 52 =
  2. 2.Double 81 =
  3. 3.Double 39 =
  4. 4.Half of 50 =
  5. 5.Double 31 =
  6. 6.Double 77 =
  7. 7.Half of 38 =
  8. 8.Double 61 =
  9. 9.Half of 92 =
  10. 10.Half of 52 =
  11. 11.Half of 188 =
  12. 12.Double 28 =
  13. 13.Half of 156 =
  14. 14.Double 25 =
  15. 15.Double 51 =
  16. 16.Half of 184 =
  17. 17.Double 53 =
  18. 18.Double 65 =
  19. 19.Double 43 =
  20. 20.Half of 90 =
  21. 21.Double 54 =
  22. 22.Half of 80 =
  23. 23.Half of 170 =
  24. 24.Half of 86 =
  25. 25.Half of 48 =
  26. 26.Double 46 =
  27. 27.Double 76 =
  28. 28.Half of 96 =
  29. 29.Half of 84 =
  30. 30.Double 96 =
  31. 31.Half of 94 =
  32. 32.Double 69 =
  33. 33.Double 19 =
  34. 34.Half of 60 =
  35. 35.Double 84 =
  36. 36.Double 71 =
  37. 37.Half of 174 =
  38. 38.Double 73 =
  39. 39.Double 48 =
  40. 40.Double 24 =

Answer key

  1. 104
  2. 162
  3. 78
  4. 25
  5. 62
  6. 154
  7. 19
  8. 122
  9. 46
  10. 26
  11. 94
  12. 56
  13. 78
  14. 50
  15. 102
  16. 92
  17. 106
  18. 130
  19. 86
  20. 45
  21. 108
  22. 40
  23. 85
  24. 43
  25. 24
  26. 92
  27. 152
  28. 48
  29. 42
  30. 192
  31. 47
  32. 138
  33. 38
  34. 30
  35. 168
  36. 142
  37. 87
  38. 146
  39. 96
  40. 48

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