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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 427 · 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 158 =
  2. 2.Double 46 =
  3. 3.Half of 48 =
  4. 4.Half of 198 =
  5. 5.Double 23 =
  6. 6.Double 31 =
  7. 7.Double 28 =
  8. 8.Half of 60 =
  9. 9.Double 39 =
  10. 10.Half of 142 =
  11. 11.Double 21 =
  12. 12.Double 34 =
  13. 13.Half of 28 =
  14. 14.Double 47 =
  15. 15.Double 95 =
  16. 16.Double 24 =
  17. 17.Half of 118 =
  18. 18.Double 33 =
  19. 19.Half of 164 =
  20. 20.Double 63 =
  21. 21.Half of 188 =
  22. 22.Double 77 =
  23. 23.Double 79 =
  24. 24.Double 85 =
  25. 25.Half of 168 =
  26. 26.Double 26 =
  27. 27.Half of 110 =
  28. 28.Double 71 =
  29. 29.Half of 178 =
  30. 30.Half of 40 =
  31. 31.Double 87 =
  32. 32.Half of 128 =
  33. 33.Double 91 =
  34. 34.Half of 108 =
  35. 35.Half of 94 =
  36. 36.Double 42 =
  37. 37.Half of 96 =
  38. 38.Half of 184 =
  39. 39.Double 67 =
  40. 40.Half of 46 =

Answer key

  1. 79
  2. 92
  3. 24
  4. 99
  5. 46
  6. 62
  7. 56
  8. 30
  9. 78
  10. 71
  11. 42
  12. 68
  13. 14
  14. 94
  15. 190
  16. 48
  17. 59
  18. 66
  19. 82
  20. 126
  21. 94
  22. 154
  23. 158
  24. 170
  25. 84
  26. 52
  27. 55
  28. 142
  29. 89
  30. 20
  31. 174
  32. 64
  33. 182
  34. 54
  35. 47
  36. 84
  37. 48
  38. 92
  39. 134
  40. 23

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