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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 692 · 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 95 =
  2. 2.Double 73 =
  3. 3.Double 47 =
  4. 4.Half of 140 =
  5. 5.Half of 168 =
  6. 6.Half of 52 =
  7. 7.Double 46 =
  8. 8.Double 76 =
  9. 9.Half of 66 =
  10. 10.Half of 102 =
  11. 11.Double 31 =
  12. 12.Double 18 =
  13. 13.Half of 84 =
  14. 14.Half of 130 =
  15. 15.Double 54 =
  16. 16.Half of 116 =
  17. 17.Double 83 =
  18. 18.Half of 100 =
  19. 19.Double 59 =
  20. 20.Double 34 =
  21. 21.Double 41 =
  22. 22.Half of 62 =
  23. 23.Half of 26 =
  24. 24.Double 38 =
  25. 25.Half of 104 =
  26. 26.Double 85 =
  27. 27.Double 26 =
  28. 28.Half of 36 =
  29. 29.Half of 46 =
  30. 30.Half of 106 =
  31. 31.Half of 196 =
  32. 32.Half of 184 =
  33. 33.Double 69 =
  34. 34.Double 51 =
  35. 35.Double 23 =
  36. 36.Double 67 =
  37. 37.Double 91 =
  38. 38.Half of 152 =
  39. 39.Half of 166 =
  40. 40.Half of 122 =

Answer key

  1. 190
  2. 146
  3. 94
  4. 70
  5. 84
  6. 26
  7. 92
  8. 152
  9. 33
  10. 51
  11. 62
  12. 36
  13. 42
  14. 65
  15. 108
  16. 58
  17. 166
  18. 50
  19. 118
  20. 68
  21. 82
  22. 31
  23. 13
  24. 76
  25. 52
  26. 170
  27. 52
  28. 18
  29. 23
  30. 53
  31. 98
  32. 92
  33. 138
  34. 102
  35. 46
  36. 134
  37. 182
  38. 76
  39. 83
  40. 61

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