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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 816 · 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 29 =
  2. 2.Double 79 =
  3. 3.Double 25 =
  4. 4.Half of 150 =
  5. 5.Half of 102 =
  6. 6.Double 75 =
  7. 7.Double 31 =
  8. 8.Double 51 =
  9. 9.Double 77 =
  10. 10.Half of 76 =
  11. 11.Half of 60 =
  12. 12.Double 85 =
  13. 13.Half of 66 =
  14. 14.Double 21 =
  15. 15.Double 41 =
  16. 16.Double 58 =
  17. 17.Double 71 =
  18. 18.Half of 26 =
  19. 19.Double 84 =
  20. 20.Double 68 =
  21. 21.Half of 192 =
  22. 22.Double 35 =
  23. 23.Half of 134 =
  24. 24.Double 19 =
  25. 25.Half of 78 =
  26. 26.Double 98 =
  27. 27.Half of 94 =
  28. 28.Half of 152 =
  29. 29.Double 89 =
  30. 30.Half of 160 =
  31. 31.Half of 164 =
  32. 32.Double 47 =
  33. 33.Half of 128 =
  34. 34.Half of 40 =
  35. 35.Half of 148 =
  36. 36.Double 97 =
  37. 37.Double 81 =
  38. 38.Half of 74 =
  39. 39.Half of 54 =
  40. 40.Half of 42 =

Answer key

  1. 58
  2. 158
  3. 50
  4. 75
  5. 51
  6. 150
  7. 62
  8. 102
  9. 154
  10. 38
  11. 30
  12. 170
  13. 33
  14. 42
  15. 82
  16. 116
  17. 142
  18. 13
  19. 168
  20. 136
  21. 96
  22. 70
  23. 67
  24. 38
  25. 39
  26. 196
  27. 47
  28. 76
  29. 178
  30. 80
  31. 82
  32. 94
  33. 64
  34. 20
  35. 74
  36. 194
  37. 162
  38. 37
  39. 27
  40. 21

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