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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 404 · 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 93 =
  2. 2.Double 45 =
  3. 3.Double 55 =
  4. 4.Double 52 =
  5. 5.Half of 128 =
  6. 6.Double 98 =
  7. 7.Half of 132 =
  8. 8.Double 27 =
  9. 9.Half of 82 =
  10. 10.Half of 28 =
  11. 11.Double 83 =
  12. 12.Double 51 =
  13. 13.Double 29 =
  14. 14.Half of 80 =
  15. 15.Double 95 =
  16. 16.Half of 68 =
  17. 17.Double 99 =
  18. 18.Double 18 =
  19. 19.Double 87 =
  20. 20.Half of 34 =
  21. 21.Double 71 =
  22. 22.Double 17 =
  23. 23.Double 21 =
  24. 24.Double 49 =
  25. 25.Double 19 =
  26. 26.Half of 102 =
  27. 27.Double 32 =
  28. 28.Double 96 =
  29. 29.Double 75 =
  30. 30.Double 81 =
  31. 31.Half of 60 =
  32. 32.Half of 170 =
  33. 33.Half of 154 =
  34. 34.Half of 52 =
  35. 35.Half of 126 =
  36. 36.Half of 96 =
  37. 37.Half of 98 =
  38. 38.Half of 62 =
  39. 39.Double 66 =
  40. 40.Half of 38 =

Answer key

  1. 186
  2. 90
  3. 110
  4. 104
  5. 64
  6. 196
  7. 66
  8. 54
  9. 41
  10. 14
  11. 166
  12. 102
  13. 58
  14. 40
  15. 190
  16. 34
  17. 198
  18. 36
  19. 174
  20. 17
  21. 142
  22. 34
  23. 42
  24. 98
  25. 38
  26. 51
  27. 64
  28. 192
  29. 150
  30. 162
  31. 30
  32. 85
  33. 77
  34. 26
  35. 63
  36. 48
  37. 49
  38. 31
  39. 132
  40. 19

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