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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 686 · 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 28 =
  2. 2.Double 26 =
  3. 3.Half of 170 =
  4. 4.Double 34 =
  5. 5.Double 71 =
  6. 6.Double 73 =
  7. 7.Half of 162 =
  8. 8.Double 31 =
  9. 9.Half of 166 =
  10. 10.Half of 132 =
  11. 11.Half of 176 =
  12. 12.Double 94 =
  13. 13.Double 95 =
  14. 14.Double 81 =
  15. 15.Half of 92 =
  16. 16.Double 52 =
  17. 17.Double 36 =
  18. 18.Double 28 =
  19. 19.Double 29 =
  20. 20.Half of 70 =
  21. 21.Double 77 =
  22. 22.Double 55 =
  23. 23.Half of 72 =
  24. 24.Double 46 =
  25. 25.Half of 178 =
  26. 26.Double 62 =
  27. 27.Double 41 =
  28. 28.Double 79 =
  29. 29.Half of 108 =
  30. 30.Double 32 =
  31. 31.Double 47 =
  32. 32.Half of 128 =
  33. 33.Double 75 =
  34. 34.Half of 102 =
  35. 35.Double 37 =
  36. 36.Double 99 =
  37. 37.Double 61 =
  38. 38.Half of 196 =
  39. 39.Half of 114 =
  40. 40.Half of 52 =

Answer key

  1. 14
  2. 52
  3. 85
  4. 68
  5. 142
  6. 146
  7. 81
  8. 62
  9. 83
  10. 66
  11. 88
  12. 188
  13. 190
  14. 162
  15. 46
  16. 104
  17. 72
  18. 56
  19. 58
  20. 35
  21. 154
  22. 110
  23. 36
  24. 92
  25. 89
  26. 124
  27. 82
  28. 158
  29. 54
  30. 64
  31. 94
  32. 64
  33. 150
  34. 51
  35. 74
  36. 198
  37. 122
  38. 98
  39. 57
  40. 26

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