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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 401 · 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 194 =
  2. 2.Double 47 =
  3. 3.Double 31 =
  4. 4.Double 54 =
  5. 5.Half of 192 =
  6. 6.Double 89 =
  7. 7.Double 63 =
  8. 8.Half of 120 =
  9. 9.Double 21 =
  10. 10.Half of 54 =
  11. 11.Double 93 =
  12. 12.Half of 82 =
  13. 13.Half of 188 =
  14. 14.Half of 104 =
  15. 15.Double 99 =
  16. 16.Half of 92 =
  17. 17.Double 35 =
  18. 18.Double 33 =
  19. 19.Half of 74 =
  20. 20.Half of 178 =
  21. 21.Double 23 =
  22. 22.Double 26 =
  23. 23.Half of 122 =
  24. 24.Double 32 =
  25. 25.Half of 40 =
  26. 26.Double 18 =
  27. 27.Half of 34 =
  28. 28.Double 36 =
  29. 29.Double 61 =
  30. 30.Half of 70 =
  31. 31.Half of 184 =
  32. 32.Double 85 =
  33. 33.Half of 142 =
  34. 34.Double 72 =
  35. 35.Double 73 =
  36. 36.Half of 56 =
  37. 37.Double 91 =
  38. 38.Double 64 =
  39. 39.Half of 148 =
  40. 40.Double 38 =

Answer key

  1. 97
  2. 94
  3. 62
  4. 108
  5. 96
  6. 178
  7. 126
  8. 60
  9. 42
  10. 27
  11. 186
  12. 41
  13. 94
  14. 52
  15. 198
  16. 46
  17. 70
  18. 66
  19. 37
  20. 89
  21. 46
  22. 52
  23. 61
  24. 64
  25. 20
  26. 36
  27. 17
  28. 72
  29. 122
  30. 35
  31. 92
  32. 170
  33. 71
  34. 144
  35. 146
  36. 28
  37. 182
  38. 128
  39. 74
  40. 76

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