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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 329 · 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 112 =
  2. 2.Half of 174 =
  3. 3.Half of 158 =
  4. 4.Half of 76 =
  5. 5.Double 72 =
  6. 6.Double 27 =
  7. 7.Double 71 =
  8. 8.Double 96 =
  9. 9.Half of 124 =
  10. 10.Double 68 =
  11. 11.Double 95 =
  12. 12.Half of 126 =
  13. 13.Double 46 =
  14. 14.Half of 108 =
  15. 15.Double 94 =
  16. 16.Double 51 =
  17. 17.Double 39 =
  18. 18.Double 24 =
  19. 19.Half of 150 =
  20. 20.Half of 146 =
  21. 21.Half of 130 =
  22. 22.Double 26 =
  23. 23.Half of 154 =
  24. 24.Double 55 =
  25. 25.Half of 140 =
  26. 26.Half of 68 =
  27. 27.Half of 38 =
  28. 28.Double 92 =
  29. 29.Half of 162 =
  30. 30.Half of 70 =
  31. 31.Double 31 =
  32. 32.Double 33 =
  33. 33.Half of 84 =
  34. 34.Half of 132 =
  35. 35.Half of 92 =
  36. 36.Half of 128 =
  37. 37.Double 91 =
  38. 38.Half of 48 =
  39. 39.Double 89 =
  40. 40.Double 28 =

Answer key

  1. 56
  2. 87
  3. 79
  4. 38
  5. 144
  6. 54
  7. 142
  8. 192
  9. 62
  10. 136
  11. 190
  12. 63
  13. 92
  14. 54
  15. 188
  16. 102
  17. 78
  18. 48
  19. 75
  20. 73
  21. 65
  22. 52
  23. 77
  24. 110
  25. 70
  26. 34
  27. 19
  28. 184
  29. 81
  30. 35
  31. 62
  32. 66
  33. 42
  34. 66
  35. 46
  36. 64
  37. 182
  38. 24
  39. 178
  40. 56

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