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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 597 · 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 138 =
  2. 2.Double 25 =
  3. 3.Half of 60 =
  4. 4.Double 35 =
  5. 5.Double 53 =
  6. 6.Double 46 =
  7. 7.Half of 64 =
  8. 8.Half of 120 =
  9. 9.Half of 36 =
  10. 10.Half of 186 =
  11. 11.Double 99 =
  12. 12.Half of 140 =
  13. 13.Half of 152 =
  14. 14.Half of 130 =
  15. 15.Double 36 =
  16. 16.Half of 38 =
  17. 17.Double 28 =
  18. 18.Half of 52 =
  19. 19.Double 92 =
  20. 20.Half of 150 =
  21. 21.Double 51 =
  22. 22.Half of 104 =
  23. 23.Double 24 =
  24. 24.Half of 94 =
  25. 25.Double 23 =
  26. 26.Double 26 =
  27. 27.Half of 50 =
  28. 28.Half of 136 =
  29. 29.Half of 66 =
  30. 30.Half of 54 =
  31. 31.Half of 160 =
  32. 32.Half of 172 =
  33. 33.Half of 78 =
  34. 34.Double 89 =
  35. 35.Double 17 =
  36. 36.Double 42 =
  37. 37.Double 33 =
  38. 38.Double 62 =
  39. 39.Double 21 =
  40. 40.Half of 74 =

Answer key

  1. 69
  2. 50
  3. 30
  4. 70
  5. 106
  6. 92
  7. 32
  8. 60
  9. 18
  10. 93
  11. 198
  12. 70
  13. 76
  14. 65
  15. 72
  16. 19
  17. 56
  18. 26
  19. 184
  20. 75
  21. 102
  22. 52
  23. 48
  24. 47
  25. 46
  26. 52
  27. 25
  28. 68
  29. 33
  30. 27
  31. 80
  32. 86
  33. 39
  34. 178
  35. 34
  36. 84
  37. 66
  38. 124
  39. 42
  40. 37

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