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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 112 · 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 166 =
  2. 2.Half of 134 =
  3. 3.Half of 168 =
  4. 4.Half of 72 =
  5. 5.Double 94 =
  6. 6.Double 41 =
  7. 7.Half of 32 =
  8. 8.Half of 58 =
  9. 9.Half of 158 =
  10. 10.Double 37 =
  11. 11.Half of 70 =
  12. 12.Double 29 =
  13. 13.Half of 190 =
  14. 14.Half of 106 =
  15. 15.Half of 150 =
  16. 16.Double 82 =
  17. 17.Double 44 =
  18. 18.Half of 36 =
  19. 19.Half of 176 =
  20. 20.Half of 120 =
  21. 21.Half of 44 =
  22. 22.Double 22 =
  23. 23.Half of 196 =
  24. 24.Half of 34 =
  25. 25.Double 23 =
  26. 26.Half of 128 =
  27. 27.Double 49 =
  28. 28.Half of 170 =
  29. 29.Double 62 =
  30. 30.Half of 62 =
  31. 31.Half of 94 =
  32. 32.Double 93 =
  33. 33.Half of 98 =
  34. 34.Half of 130 =
  35. 35.Half of 46 =
  36. 36.Half of 38 =
  37. 37.Double 73 =
  38. 38.Half of 192 =
  39. 39.Double 28 =
  40. 40.Double 39 =

Answer key

  1. 83
  2. 67
  3. 84
  4. 36
  5. 188
  6. 82
  7. 16
  8. 29
  9. 79
  10. 74
  11. 35
  12. 58
  13. 95
  14. 53
  15. 75
  16. 164
  17. 88
  18. 18
  19. 88
  20. 60
  21. 22
  22. 44
  23. 98
  24. 17
  25. 46
  26. 64
  27. 98
  28. 85
  29. 124
  30. 31
  31. 47
  32. 186
  33. 49
  34. 65
  35. 23
  36. 19
  37. 146
  38. 96
  39. 56
  40. 78

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