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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 582 · 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 69 =
  2. 2.Half of 122 =
  3. 3.Double 32 =
  4. 4.Double 24 =
  5. 5.Double 81 =
  6. 6.Double 48 =
  7. 7.Half of 64 =
  8. 8.Double 95 =
  9. 9.Double 72 =
  10. 10.Double 29 =
  11. 11.Half of 174 =
  12. 12.Half of 62 =
  13. 13.Half of 48 =
  14. 14.Half of 180 =
  15. 15.Double 89 =
  16. 16.Double 36 =
  17. 17.Half of 182 =
  18. 18.Double 62 =
  19. 19.Half of 162 =
  20. 20.Double 63 =
  21. 21.Half of 80 =
  22. 22.Double 31 =
  23. 23.Double 75 =
  24. 24.Half of 28 =
  25. 25.Double 51 =
  26. 26.Double 83 =
  27. 27.Double 66 =
  28. 28.Half of 138 =
  29. 29.Double 44 =
  30. 30.Half of 158 =
  31. 31.Half of 134 =
  32. 32.Half of 150 =
  33. 33.Half of 102 =
  34. 34.Double 85 =
  35. 35.Double 26 =
  36. 36.Half of 68 =
  37. 37.Half of 100 =
  38. 38.Double 39 =
  39. 39.Half of 178 =
  40. 40.Half of 108 =

Answer key

  1. 138
  2. 61
  3. 64
  4. 48
  5. 162
  6. 96
  7. 32
  8. 190
  9. 144
  10. 58
  11. 87
  12. 31
  13. 24
  14. 90
  15. 178
  16. 72
  17. 91
  18. 124
  19. 81
  20. 126
  21. 40
  22. 62
  23. 150
  24. 14
  25. 102
  26. 166
  27. 132
  28. 69
  29. 88
  30. 79
  31. 67
  32. 75
  33. 51
  34. 170
  35. 52
  36. 34
  37. 50
  38. 78
  39. 89
  40. 54

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