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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 176 · 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 76 =
  2. 2.Half of 68 =
  3. 3.Half of 136 =
  4. 4.Double 61 =
  5. 5.Double 53 =
  6. 6.Double 38 =
  7. 7.Double 22 =
  8. 8.Double 16 =
  9. 9.Double 71 =
  10. 10.Double 54 =
  11. 11.Half of 60 =
  12. 12.Double 67 =
  13. 13.Half of 50 =
  14. 14.Double 77 =
  15. 15.Double 87 =
  16. 16.Double 27 =
  17. 17.Double 62 =
  18. 18.Half of 164 =
  19. 19.Half of 178 =
  20. 20.Half of 156 =
  21. 21.Double 47 =
  22. 22.Double 68 =
  23. 23.Double 35 =
  24. 24.Double 52 =
  25. 25.Half of 30 =
  26. 26.Half of 34 =
  27. 27.Half of 106 =
  28. 28.Double 31 =
  29. 29.Half of 158 =
  30. 30.Half of 88 =
  31. 31.Half of 186 =
  32. 32.Half of 84 =
  33. 33.Half of 172 =
  34. 34.Half of 26 =
  35. 35.Half of 132 =
  36. 36.Double 64 =
  37. 37.Half of 150 =
  38. 38.Double 96 =
  39. 39.Half of 56 =
  40. 40.Half of 168 =

Answer key

  1. 152
  2. 34
  3. 68
  4. 122
  5. 106
  6. 76
  7. 44
  8. 32
  9. 142
  10. 108
  11. 30
  12. 134
  13. 25
  14. 154
  15. 174
  16. 54
  17. 124
  18. 82
  19. 89
  20. 78
  21. 94
  22. 136
  23. 70
  24. 104
  25. 15
  26. 17
  27. 53
  28. 62
  29. 79
  30. 44
  31. 93
  32. 42
  33. 86
  34. 13
  35. 66
  36. 128
  37. 75
  38. 192
  39. 28
  40. 84

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