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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 42 · 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 94 =
  2. 2.Half of 182 =
  3. 3.Double 62 =
  4. 4.Half of 78 =
  5. 5.Half of 134 =
  6. 6.Double 83 =
  7. 7.Double 84 =
  8. 8.Double 18 =
  9. 9.Double 32 =
  10. 10.Double 92 =
  11. 11.Double 82 =
  12. 12.Half of 120 =
  13. 13.Double 85 =
  14. 14.Double 93 =
  15. 15.Double 22 =
  16. 16.Double 81 =
  17. 17.Double 58 =
  18. 18.Half of 88 =
  19. 19.Half of 140 =
  20. 20.Double 66 =
  21. 21.Double 59 =
  22. 22.Double 27 =
  23. 23.Double 54 =
  24. 24.Half of 138 =
  25. 25.Double 96 =
  26. 26.Double 77 =
  27. 27.Half of 176 =
  28. 28.Half of 76 =
  29. 29.Half of 150 =
  30. 30.Half of 188 =
  31. 31.Double 23 =
  32. 32.Double 48 =
  33. 33.Half of 30 =
  34. 34.Double 72 =
  35. 35.Half of 40 =
  36. 36.Half of 156 =
  37. 37.Half of 50 =
  38. 38.Half of 60 =
  39. 39.Half of 144 =
  40. 40.Double 68 =

Answer key

  1. 47
  2. 91
  3. 124
  4. 39
  5. 67
  6. 166
  7. 168
  8. 36
  9. 64
  10. 184
  11. 164
  12. 60
  13. 170
  14. 186
  15. 44
  16. 162
  17. 116
  18. 44
  19. 70
  20. 132
  21. 118
  22. 54
  23. 108
  24. 69
  25. 192
  26. 154
  27. 88
  28. 38
  29. 75
  30. 94
  31. 46
  32. 96
  33. 15
  34. 144
  35. 20
  36. 78
  37. 25
  38. 30
  39. 72
  40. 136

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