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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 538 · 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 68 =
  2. 2.Double 95 =
  3. 3.Double 83 =
  4. 4.Half of 122 =
  5. 5.Half of 32 =
  6. 6.Double 49 =
  7. 7.Half of 106 =
  8. 8.Half of 86 =
  9. 9.Double 81 =
  10. 10.Half of 30 =
  11. 11.Half of 114 =
  12. 12.Half of 178 =
  13. 13.Double 31 =
  14. 14.Double 36 =
  15. 15.Double 82 =
  16. 16.Half of 58 =
  17. 17.Double 67 =
  18. 18.Half of 164 =
  19. 19.Half of 110 =
  20. 20.Half of 52 =
  21. 21.Half of 120 =
  22. 22.Double 54 =
  23. 23.Half of 190 =
  24. 24.Double 97 =
  25. 25.Double 23 =
  26. 26.Double 74 =
  27. 27.Half of 46 =
  28. 28.Half of 154 =
  29. 29.Half of 104 =
  30. 30.Double 57 =
  31. 31.Double 87 =
  32. 32.Double 43 =
  33. 33.Double 16 =
  34. 34.Double 65 =
  35. 35.Half of 64 =
  36. 36.Double 21 =
  37. 37.Half of 128 =
  38. 38.Double 85 =
  39. 39.Double 91 =
  40. 40.Double 17 =

Answer key

  1. 136
  2. 190
  3. 166
  4. 61
  5. 16
  6. 98
  7. 53
  8. 43
  9. 162
  10. 15
  11. 57
  12. 89
  13. 62
  14. 72
  15. 164
  16. 29
  17. 134
  18. 82
  19. 55
  20. 26
  21. 60
  22. 108
  23. 95
  24. 194
  25. 46
  26. 148
  27. 23
  28. 77
  29. 52
  30. 114
  31. 174
  32. 86
  33. 32
  34. 130
  35. 32
  36. 42
  37. 64
  38. 170
  39. 182
  40. 34

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