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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 827 · 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 170 =
  2. 2.Half of 132 =
  3. 3.Double 33 =
  4. 4.Half of 48 =
  5. 5.Half of 102 =
  6. 6.Half of 180 =
  7. 7.Half of 106 =
  8. 8.Half of 144 =
  9. 9.Double 99 =
  10. 10.Double 58 =
  11. 11.Double 44 =
  12. 12.Double 76 =
  13. 13.Double 38 =
  14. 14.Half of 82 =
  15. 15.Double 18 =
  16. 16.Double 42 =
  17. 17.Double 46 =
  18. 18.Half of 36 =
  19. 19.Double 41 =
  20. 20.Double 45 =
  21. 21.Double 66 =
  22. 22.Double 52 =
  23. 23.Half of 166 =
  24. 24.Double 89 =
  25. 25.Double 55 =
  26. 26.Double 97 =
  27. 27.Double 85 =
  28. 28.Half of 162 =
  29. 29.Double 95 =
  30. 30.Double 69 =
  31. 31.Half of 156 =
  32. 32.Double 36 =
  33. 33.Half of 148 =
  34. 34.Half of 136 =
  35. 35.Half of 128 =
  36. 36.Half of 34 =
  37. 37.Half of 124 =
  38. 38.Half of 160 =
  39. 39.Half of 80 =
  40. 40.Half of 96 =

Answer key

  1. 85
  2. 66
  3. 66
  4. 24
  5. 51
  6. 90
  7. 53
  8. 72
  9. 198
  10. 116
  11. 88
  12. 152
  13. 76
  14. 41
  15. 36
  16. 84
  17. 92
  18. 18
  19. 82
  20. 90
  21. 132
  22. 104
  23. 83
  24. 178
  25. 110
  26. 194
  27. 170
  28. 81
  29. 190
  30. 138
  31. 78
  32. 72
  33. 74
  34. 68
  35. 64
  36. 17
  37. 62
  38. 80
  39. 40
  40. 48

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