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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 593 · 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 154 =
  2. 2.Half of 26 =
  3. 3.Double 25 =
  4. 4.Double 51 =
  5. 5.Half of 122 =
  6. 6.Double 41 =
  7. 7.Double 83 =
  8. 8.Half of 116 =
  9. 9.Half of 162 =
  10. 10.Double 97 =
  11. 11.Half of 146 =
  12. 12.Double 22 =
  13. 13.Double 52 =
  14. 14.Half of 96 =
  15. 15.Double 62 =
  16. 16.Half of 98 =
  17. 17.Half of 46 =
  18. 18.Half of 44 =
  19. 19.Half of 72 =
  20. 20.Double 68 =
  21. 21.Double 96 =
  22. 22.Double 19 =
  23. 23.Half of 182 =
  24. 24.Double 31 =
  25. 25.Double 64 =
  26. 26.Double 82 =
  27. 27.Half of 48 =
  28. 28.Half of 174 =
  29. 29.Half of 100 =
  30. 30.Double 86 =
  31. 31.Half of 38 =
  32. 32.Half of 166 =
  33. 33.Double 58 =
  34. 34.Double 67 =
  35. 35.Double 81 =
  36. 36.Double 44 =
  37. 37.Double 38 =
  38. 38.Half of 178 =
  39. 39.Half of 124 =
  40. 40.Half of 150 =

Answer key

  1. 77
  2. 13
  3. 50
  4. 102
  5. 61
  6. 82
  7. 166
  8. 58
  9. 81
  10. 194
  11. 73
  12. 44
  13. 104
  14. 48
  15. 124
  16. 49
  17. 23
  18. 22
  19. 36
  20. 136
  21. 192
  22. 38
  23. 91
  24. 62
  25. 128
  26. 164
  27. 24
  28. 87
  29. 50
  30. 172
  31. 19
  32. 83
  33. 116
  34. 134
  35. 162
  36. 88
  37. 76
  38. 89
  39. 62
  40. 75

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