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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 481 · 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 172 =
  2. 2.Double 95 =
  3. 3.Half of 158 =
  4. 4.Double 37 =
  5. 5.Half of 38 =
  6. 6.Half of 156 =
  7. 7.Half of 64 =
  8. 8.Double 87 =
  9. 9.Double 71 =
  10. 10.Double 21 =
  11. 11.Double 29 =
  12. 12.Half of 28 =
  13. 13.Half of 84 =
  14. 14.Double 79 =
  15. 15.Half of 180 =
  16. 16.Half of 34 =
  17. 17.Double 52 =
  18. 18.Half of 62 =
  19. 19.Double 84 =
  20. 20.Double 47 =
  21. 21.Double 99 =
  22. 22.Half of 196 =
  23. 23.Double 41 =
  24. 24.Double 32 =
  25. 25.Half of 72 =
  26. 26.Half of 108 =
  27. 27.Double 57 =
  28. 28.Double 46 =
  29. 29.Double 22 =
  30. 30.Double 98 =
  31. 31.Half of 30 =
  32. 32.Half of 176 =
  33. 33.Double 17 =
  34. 34.Half of 58 =
  35. 35.Double 45 =
  36. 36.Double 56 =
  37. 37.Double 69 =
  38. 38.Half of 26 =
  39. 39.Half of 194 =
  40. 40.Half of 136 =

Answer key

  1. 86
  2. 190
  3. 79
  4. 74
  5. 19
  6. 78
  7. 32
  8. 174
  9. 142
  10. 42
  11. 58
  12. 14
  13. 42
  14. 158
  15. 90
  16. 17
  17. 104
  18. 31
  19. 168
  20. 94
  21. 198
  22. 98
  23. 82
  24. 64
  25. 36
  26. 54
  27. 114
  28. 92
  29. 44
  30. 196
  31. 15
  32. 88
  33. 34
  34. 29
  35. 90
  36. 112
  37. 138
  38. 13
  39. 97
  40. 68

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