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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 664 · 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 90 =
  2. 2.Half of 54 =
  3. 3.Half of 74 =
  4. 4.Half of 190 =
  5. 5.Double 18 =
  6. 6.Double 38 =
  7. 7.Half of 80 =
  8. 8.Half of 124 =
  9. 9.Double 73 =
  10. 10.Double 78 =
  11. 11.Double 54 =
  12. 12.Half of 94 =
  13. 13.Half of 98 =
  14. 14.Double 95 =
  15. 15.Double 59 =
  16. 16.Half of 32 =
  17. 17.Double 46 =
  18. 18.Double 42 =
  19. 19.Double 41 =
  20. 20.Half of 104 =
  21. 21.Half of 132 =
  22. 22.Half of 48 =
  23. 23.Double 62 =
  24. 24.Half of 76 =
  25. 25.Double 21 =
  26. 26.Half of 70 =
  27. 27.Double 29 =
  28. 28.Half of 146 =
  29. 29.Double 69 =
  30. 30.Half of 62 =
  31. 31.Double 87 =
  32. 32.Half of 64 =
  33. 33.Double 48 =
  34. 34.Double 81 =
  35. 35.Half of 164 =
  36. 36.Double 84 =
  37. 37.Half of 168 =
  38. 38.Double 28 =
  39. 39.Half of 52 =
  40. 40.Double 34 =

Answer key

  1. 45
  2. 27
  3. 37
  4. 95
  5. 36
  6. 76
  7. 40
  8. 62
  9. 146
  10. 156
  11. 108
  12. 47
  13. 49
  14. 190
  15. 118
  16. 16
  17. 92
  18. 84
  19. 82
  20. 52
  21. 66
  22. 24
  23. 124
  24. 38
  25. 42
  26. 35
  27. 58
  28. 73
  29. 138
  30. 31
  31. 174
  32. 32
  33. 96
  34. 162
  35. 82
  36. 168
  37. 84
  38. 56
  39. 26
  40. 68

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