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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 601 · 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 116 =
  2. 2.Half of 192 =
  3. 3.Double 53 =
  4. 4.Double 42 =
  5. 5.Double 91 =
  6. 6.Half of 158 =
  7. 7.Half of 40 =
  8. 8.Double 28 =
  9. 9.Half of 170 =
  10. 10.Double 74 =
  11. 11.Double 33 =
  12. 12.Double 66 =
  13. 13.Half of 124 =
  14. 14.Double 89 =
  15. 15.Half of 64 =
  16. 16.Half of 112 =
  17. 17.Half of 88 =
  18. 18.Double 24 =
  19. 19.Double 41 =
  20. 20.Double 72 =
  21. 21.Double 44 =
  22. 22.Half of 60 =
  23. 23.Double 55 =
  24. 24.Double 77 =
  25. 25.Half of 108 =
  26. 26.Double 85 =
  27. 27.Half of 78 =
  28. 28.Half of 92 =
  29. 29.Half of 106 =
  30. 30.Double 21 =
  31. 31.Double 64 =
  32. 32.Half of 96 =
  33. 33.Half of 120 =
  34. 34.Half of 128 =
  35. 35.Double 68 =
  36. 36.Double 39 =
  37. 37.Half of 44 =
  38. 38.Half of 72 =
  39. 39.Half of 184 =
  40. 40.Double 81 =

Answer key

  1. 58
  2. 96
  3. 106
  4. 84
  5. 182
  6. 79
  7. 20
  8. 56
  9. 85
  10. 148
  11. 66
  12. 132
  13. 62
  14. 178
  15. 32
  16. 56
  17. 44
  18. 48
  19. 82
  20. 144
  21. 88
  22. 30
  23. 110
  24. 154
  25. 54
  26. 170
  27. 39
  28. 46
  29. 53
  30. 42
  31. 128
  32. 48
  33. 60
  34. 64
  35. 136
  36. 78
  37. 22
  38. 36
  39. 92
  40. 162

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