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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 477 · 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 44 =
  2. 2.Half of 144 =
  3. 3.Double 21 =
  4. 4.Half of 186 =
  5. 5.Half of 70 =
  6. 6.Half of 194 =
  7. 7.Double 71 =
  8. 8.Double 91 =
  9. 9.Double 25 =
  10. 10.Double 83 =
  11. 11.Double 92 =
  12. 12.Half of 166 =
  13. 13.Double 45 =
  14. 14.Double 68 =
  15. 15.Double 35 =
  16. 16.Double 54 =
  17. 17.Double 63 =
  18. 18.Double 99 =
  19. 19.Half of 198 =
  20. 20.Half of 34 =
  21. 21.Double 53 =
  22. 22.Half of 90 =
  23. 23.Double 34 =
  24. 24.Half of 98 =
  25. 25.Half of 162 =
  26. 26.Half of 118 =
  27. 27.Double 73 =
  28. 28.Double 52 =
  29. 29.Double 41 =
  30. 30.Half of 60 =
  31. 31.Half of 136 =
  32. 32.Half of 180 =
  33. 33.Double 51 =
  34. 34.Double 22 =
  35. 35.Half of 54 =
  36. 36.Double 78 =
  37. 37.Double 67 =
  38. 38.Half of 104 =
  39. 39.Half of 82 =
  40. 40.Double 55 =

Answer key

  1. 88
  2. 72
  3. 42
  4. 93
  5. 35
  6. 97
  7. 142
  8. 182
  9. 50
  10. 166
  11. 184
  12. 83
  13. 90
  14. 136
  15. 70
  16. 108
  17. 126
  18. 198
  19. 99
  20. 17
  21. 106
  22. 45
  23. 68
  24. 49
  25. 81
  26. 59
  27. 146
  28. 104
  29. 82
  30. 30
  31. 68
  32. 90
  33. 102
  34. 44
  35. 27
  36. 156
  37. 134
  38. 52
  39. 41
  40. 110

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