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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 625 · 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 150 =
  2. 2.Double 32 =
  3. 3.Half of 52 =
  4. 4.Half of 34 =
  5. 5.Double 58 =
  6. 6.Half of 68 =
  7. 7.Double 61 =
  8. 8.Double 66 =
  9. 9.Double 31 =
  10. 10.Double 65 =
  11. 11.Half of 38 =
  12. 12.Double 89 =
  13. 13.Double 33 =
  14. 14.Double 37 =
  15. 15.Half of 82 =
  16. 16.Double 97 =
  17. 17.Double 53 =
  18. 18.Half of 186 =
  19. 19.Half of 146 =
  20. 20.Half of 48 =
  21. 21.Double 51 =
  22. 22.Half of 78 =
  23. 23.Double 95 =
  24. 24.Double 99 =
  25. 25.Half of 72 =
  26. 26.Half of 94 =
  27. 27.Half of 198 =
  28. 28.Half of 110 =
  29. 29.Double 41 =
  30. 30.Half of 104 =
  31. 31.Half of 118 =
  32. 32.Half of 170 =
  33. 33.Half of 154 =
  34. 34.Double 55 =
  35. 35.Double 39 =
  36. 36.Double 35 =
  37. 37.Double 79 =
  38. 38.Double 71 =
  39. 39.Half of 160 =
  40. 40.Half of 98 =

Answer key

  1. 75
  2. 64
  3. 26
  4. 17
  5. 116
  6. 34
  7. 122
  8. 132
  9. 62
  10. 130
  11. 19
  12. 178
  13. 66
  14. 74
  15. 41
  16. 194
  17. 106
  18. 93
  19. 73
  20. 24
  21. 102
  22. 39
  23. 190
  24. 198
  25. 36
  26. 47
  27. 99
  28. 55
  29. 82
  30. 52
  31. 59
  32. 85
  33. 77
  34. 110
  35. 78
  36. 70
  37. 158
  38. 142
  39. 80
  40. 49

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