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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 557 · 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 41 =
  2. 2.Double 51 =
  3. 3.Double 79 =
  4. 4.Double 58 =
  5. 5.Double 76 =
  6. 6.Half of 62 =
  7. 7.Double 82 =
  8. 8.Half of 46 =
  9. 9.Double 46 =
  10. 10.Double 81 =
  11. 11.Double 69 =
  12. 12.Half of 78 =
  13. 13.Half of 74 =
  14. 14.Double 56 =
  15. 15.Double 87 =
  16. 16.Half of 114 =
  17. 17.Half of 42 =
  18. 18.Double 36 =
  19. 19.Double 53 =
  20. 20.Half of 70 =
  21. 21.Half of 102 =
  22. 22.Half of 138 =
  23. 23.Double 38 =
  24. 24.Double 72 =
  25. 25.Double 75 =
  26. 26.Double 83 =
  27. 27.Half of 28 =
  28. 28.Half of 168 =
  29. 29.Half of 140 =
  30. 30.Half of 82 =
  31. 31.Half of 166 =
  32. 32.Double 31 =
  33. 33.Half of 68 =
  34. 34.Double 93 =
  35. 35.Double 18 =
  36. 36.Double 52 =
  37. 37.Double 67 =
  38. 38.Half of 48 =
  39. 39.Double 37 =
  40. 40.Double 23 =

Answer key

  1. 82
  2. 102
  3. 158
  4. 116
  5. 152
  6. 31
  7. 164
  8. 23
  9. 92
  10. 162
  11. 138
  12. 39
  13. 37
  14. 112
  15. 174
  16. 57
  17. 21
  18. 72
  19. 106
  20. 35
  21. 51
  22. 69
  23. 76
  24. 144
  25. 150
  26. 166
  27. 14
  28. 84
  29. 70
  30. 41
  31. 83
  32. 62
  33. 34
  34. 186
  35. 36
  36. 104
  37. 134
  38. 24
  39. 74
  40. 46

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