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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 155 · 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 24 =
  2. 2.Double 35 =
  3. 3.Half of 106 =
  4. 4.Double 65 =
  5. 5.Double 61 =
  6. 6.Half of 56 =
  7. 7.Double 82 =
  8. 8.Double 71 =
  9. 9.Half of 70 =
  10. 10.Double 41 =
  11. 11.Double 55 =
  12. 12.Half of 28 =
  13. 13.Double 32 =
  14. 14.Double 62 =
  15. 15.Half of 102 =
  16. 16.Double 78 =
  17. 17.Half of 48 =
  18. 18.Double 25 =
  19. 19.Double 94 =
  20. 20.Half of 118 =
  21. 21.Double 27 =
  22. 22.Half of 136 =
  23. 23.Half of 146 =
  24. 24.Double 31 =
  25. 25.Half of 40 =
  26. 26.Half of 128 =
  27. 27.Half of 82 =
  28. 28.Double 26 =
  29. 29.Half of 182 =
  30. 30.Double 73 =
  31. 31.Double 46 =
  32. 32.Half of 126 =
  33. 33.Double 79 =
  34. 34.Half of 64 =
  35. 35.Half of 144 =
  36. 36.Double 17 =
  37. 37.Double 33 =
  38. 38.Double 69 =
  39. 39.Half of 184 =
  40. 40.Half of 164 =

Answer key

  1. 48
  2. 70
  3. 53
  4. 130
  5. 122
  6. 28
  7. 164
  8. 142
  9. 35
  10. 82
  11. 110
  12. 14
  13. 64
  14. 124
  15. 51
  16. 156
  17. 24
  18. 50
  19. 188
  20. 59
  21. 54
  22. 68
  23. 73
  24. 62
  25. 20
  26. 64
  27. 41
  28. 52
  29. 91
  30. 146
  31. 92
  32. 63
  33. 158
  34. 32
  35. 72
  36. 34
  37. 66
  38. 138
  39. 92
  40. 82

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