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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 683 · 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 164 =
  2. 2.Double 38 =
  3. 3.Double 34 =
  4. 4.Half of 194 =
  5. 5.Half of 56 =
  6. 6.Double 39 =
  7. 7.Half of 76 =
  8. 8.Double 29 =
  9. 9.Double 81 =
  10. 10.Double 64 =
  11. 11.Half of 40 =
  12. 12.Half of 90 =
  13. 13.Half of 100 =
  14. 14.Half of 118 =
  15. 15.Double 31 =
  16. 16.Double 52 =
  17. 17.Double 54 =
  18. 18.Double 27 =
  19. 19.Half of 188 =
  20. 20.Half of 54 =
  21. 21.Half of 66 =
  22. 22.Half of 152 =
  23. 23.Double 56 =
  24. 24.Double 65 =
  25. 25.Double 95 =
  26. 26.Double 71 =
  27. 27.Double 53 =
  28. 28.Double 67 =
  29. 29.Double 88 =
  30. 30.Double 25 =
  31. 31.Double 16 =
  32. 32.Half of 110 =
  33. 33.Double 49 =
  34. 34.Double 73 =
  35. 35.Half of 142 =
  36. 36.Double 21 =
  37. 37.Double 51 =
  38. 38.Half of 58 =
  39. 39.Half of 68 =
  40. 40.Half of 26 =

Answer key

  1. 82
  2. 76
  3. 68
  4. 97
  5. 28
  6. 78
  7. 38
  8. 58
  9. 162
  10. 128
  11. 20
  12. 45
  13. 50
  14. 59
  15. 62
  16. 104
  17. 108
  18. 54
  19. 94
  20. 27
  21. 33
  22. 76
  23. 112
  24. 130
  25. 190
  26. 142
  27. 106
  28. 134
  29. 176
  30. 50
  31. 32
  32. 55
  33. 98
  34. 146
  35. 71
  36. 42
  37. 102
  38. 29
  39. 34
  40. 13

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