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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 726 · 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 136 =
  2. 2.Double 81 =
  3. 3.Double 27 =
  4. 4.Half of 152 =
  5. 5.Double 38 =
  6. 6.Double 45 =
  7. 7.Double 63 =
  8. 8.Double 39 =
  9. 9.Double 28 =
  10. 10.Half of 118 =
  11. 11.Double 71 =
  12. 12.Double 41 =
  13. 13.Half of 170 =
  14. 14.Half of 42 =
  15. 15.Double 16 =
  16. 16.Half of 56 =
  17. 17.Double 97 =
  18. 18.Half of 190 =
  19. 19.Double 62 =
  20. 20.Half of 130 =
  21. 21.Half of 116 =
  22. 22.Half of 74 =
  23. 23.Double 26 =
  24. 24.Half of 122 =
  25. 25.Double 55 =
  26. 26.Half of 64 =
  27. 27.Double 18 =
  28. 28.Double 42 =
  29. 29.Half of 104 =
  30. 30.Double 85 =
  31. 31.Half of 124 =
  32. 32.Half of 164 =
  33. 33.Double 92 =
  34. 34.Half of 62 =
  35. 35.Double 54 =
  36. 36.Half of 58 =
  37. 37.Half of 30 =
  38. 38.Half of 126 =
  39. 39.Half of 32 =
  40. 40.Half of 38 =

Answer key

  1. 68
  2. 162
  3. 54
  4. 76
  5. 76
  6. 90
  7. 126
  8. 78
  9. 56
  10. 59
  11. 142
  12. 82
  13. 85
  14. 21
  15. 32
  16. 28
  17. 194
  18. 95
  19. 124
  20. 65
  21. 58
  22. 37
  23. 52
  24. 61
  25. 110
  26. 32
  27. 36
  28. 84
  29. 52
  30. 170
  31. 62
  32. 82
  33. 184
  34. 31
  35. 108
  36. 29
  37. 15
  38. 63
  39. 16
  40. 19

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