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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 613 · 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 140 =
  2. 2.Half of 122 =
  3. 3.Double 18 =
  4. 4.Double 47 =
  5. 5.Double 56 =
  6. 6.Double 91 =
  7. 7.Double 75 =
  8. 8.Half of 44 =
  9. 9.Half of 46 =
  10. 10.Half of 70 =
  11. 11.Half of 38 =
  12. 12.Half of 176 =
  13. 13.Half of 166 =
  14. 14.Double 33 =
  15. 15.Half of 82 =
  16. 16.Half of 152 =
  17. 17.Double 71 =
  18. 18.Half of 130 =
  19. 19.Half of 190 =
  20. 20.Double 66 =
  21. 21.Double 22 =
  22. 22.Half of 60 =
  23. 23.Double 44 =
  24. 24.Double 52 =
  25. 25.Double 67 =
  26. 26.Half of 164 =
  27. 27.Half of 158 =
  28. 28.Half of 132 =
  29. 29.Half of 34 =
  30. 30.Half of 64 =
  31. 31.Half of 138 =
  32. 32.Double 94 =
  33. 33.Half of 30 =
  34. 34.Half of 80 =
  35. 35.Half of 168 =
  36. 36.Half of 174 =
  37. 37.Half of 104 =
  38. 38.Double 43 =
  39. 39.Double 73 =
  40. 40.Double 98 =

Answer key

  1. 70
  2. 61
  3. 36
  4. 94
  5. 112
  6. 182
  7. 150
  8. 22
  9. 23
  10. 35
  11. 19
  12. 88
  13. 83
  14. 66
  15. 41
  16. 76
  17. 142
  18. 65
  19. 95
  20. 132
  21. 44
  22. 30
  23. 88
  24. 104
  25. 134
  26. 82
  27. 79
  28. 66
  29. 17
  30. 32
  31. 69
  32. 188
  33. 15
  34. 40
  35. 84
  36. 87
  37. 52
  38. 86
  39. 146
  40. 196

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