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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 485 · 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 26 =
  2. 2.Half of 182 =
  3. 3.Half of 162 =
  4. 4.Double 35 =
  5. 5.Half of 70 =
  6. 6.Double 92 =
  7. 7.Double 42 =
  8. 8.Half of 196 =
  9. 9.Double 69 =
  10. 10.Half of 46 =
  11. 11.Half of 152 =
  12. 12.Double 34 =
  13. 13.Double 86 =
  14. 14.Double 52 =
  15. 15.Half of 28 =
  16. 16.Double 51 =
  17. 17.Half of 54 =
  18. 18.Half of 98 =
  19. 19.Double 31 =
  20. 20.Double 99 =
  21. 21.Double 54 =
  22. 22.Half of 184 =
  23. 23.Double 21 =
  24. 24.Half of 168 =
  25. 25.Half of 166 =
  26. 26.Half of 78 =
  27. 27.Half of 110 =
  28. 28.Double 61 =
  29. 29.Half of 82 =
  30. 30.Double 83 =
  31. 31.Half of 144 =
  32. 32.Half of 176 =
  33. 33.Double 58 =
  34. 34.Double 65 =
  35. 35.Double 43 =
  36. 36.Double 32 =
  37. 37.Half of 130 =
  38. 38.Half of 158 =
  39. 39.Half of 180 =
  40. 40.Double 46 =

Answer key

  1. 52
  2. 91
  3. 81
  4. 70
  5. 35
  6. 184
  7. 84
  8. 98
  9. 138
  10. 23
  11. 76
  12. 68
  13. 172
  14. 104
  15. 14
  16. 102
  17. 27
  18. 49
  19. 62
  20. 198
  21. 108
  22. 92
  23. 42
  24. 84
  25. 83
  26. 39
  27. 55
  28. 122
  29. 41
  30. 166
  31. 72
  32. 88
  33. 116
  34. 130
  35. 86
  36. 64
  37. 65
  38. 79
  39. 90
  40. 92

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