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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 608 · 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 78 =
  2. 2.Half of 28 =
  3. 3.Half of 138 =
  4. 4.Half of 146 =
  5. 5.Double 28 =
  6. 6.Double 41 =
  7. 7.Half of 98 =
  8. 8.Half of 60 =
  9. 9.Half of 102 =
  10. 10.Double 22 =
  11. 11.Double 37 =
  12. 12.Half of 140 =
  13. 13.Half of 80 =
  14. 14.Half of 70 =
  15. 15.Half of 158 =
  16. 16.Double 81 =
  17. 17.Double 86 =
  18. 18.Half of 186 =
  19. 19.Double 16 =
  20. 20.Double 19 =
  21. 21.Half of 164 =
  22. 22.Half of 168 =
  23. 23.Double 33 =
  24. 24.Half of 188 =
  25. 25.Half of 84 =
  26. 26.Double 29 =
  27. 27.Double 92 =
  28. 28.Half of 62 =
  29. 29.Double 25 =
  30. 30.Half of 94 =
  31. 31.Double 51 =
  32. 32.Double 45 =
  33. 33.Double 26 =
  34. 34.Half of 196 =
  35. 35.Double 57 =
  36. 36.Double 42 =
  37. 37.Double 18 =
  38. 38.Half of 54 =
  39. 39.Double 89 =
  40. 40.Half of 172 =

Answer key

  1. 156
  2. 14
  3. 69
  4. 73
  5. 56
  6. 82
  7. 49
  8. 30
  9. 51
  10. 44
  11. 74
  12. 70
  13. 40
  14. 35
  15. 79
  16. 162
  17. 172
  18. 93
  19. 32
  20. 38
  21. 82
  22. 84
  23. 66
  24. 94
  25. 42
  26. 58
  27. 184
  28. 31
  29. 50
  30. 47
  31. 102
  32. 90
  33. 52
  34. 98
  35. 114
  36. 84
  37. 36
  38. 27
  39. 178
  40. 86

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