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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 441 · 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 102 =
  2. 2.Half of 46 =
  3. 3.Half of 180 =
  4. 4.Half of 110 =
  5. 5.Double 45 =
  6. 6.Half of 114 =
  7. 7.Half of 72 =
  8. 8.Double 55 =
  9. 9.Double 85 =
  10. 10.Double 32 =
  11. 11.Half of 126 =
  12. 12.Half of 144 =
  13. 13.Double 37 =
  14. 14.Half of 56 =
  15. 15.Double 62 =
  16. 16.Double 27 =
  17. 17.Double 56 =
  18. 18.Half of 182 =
  19. 19.Double 29 =
  20. 20.Double 41 =
  21. 21.Half of 48 =
  22. 22.Double 87 =
  23. 23.Double 71 =
  24. 24.Half of 60 =
  25. 25.Half of 154 =
  26. 26.Half of 100 =
  27. 27.Half of 150 =
  28. 28.Double 54 =
  29. 29.Double 89 =
  30. 30.Half of 50 =
  31. 31.Double 91 =
  32. 32.Half of 30 =
  33. 33.Double 61 =
  34. 34.Half of 158 =
  35. 35.Half of 116 =
  36. 36.Double 21 =
  37. 37.Double 22 =
  38. 38.Half of 140 =
  39. 39.Double 97 =
  40. 40.Double 18 =

Answer key

  1. 51
  2. 23
  3. 90
  4. 55
  5. 90
  6. 57
  7. 36
  8. 110
  9. 170
  10. 64
  11. 63
  12. 72
  13. 74
  14. 28
  15. 124
  16. 54
  17. 112
  18. 91
  19. 58
  20. 82
  21. 24
  22. 174
  23. 142
  24. 30
  25. 77
  26. 50
  27. 75
  28. 108
  29. 178
  30. 25
  31. 182
  32. 15
  33. 122
  34. 79
  35. 58
  36. 42
  37. 44
  38. 70
  39. 194
  40. 36

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