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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 727 · 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 122 =
  2. 2.Half of 60 =
  3. 3.Half of 92 =
  4. 4.Double 63 =
  5. 5.Half of 34 =
  6. 6.Double 39 =
  7. 7.Half of 112 =
  8. 8.Half of 102 =
  9. 9.Half of 174 =
  10. 10.Double 97 =
  11. 11.Double 85 =
  12. 12.Double 51 =
  13. 13.Half of 176 =
  14. 14.Double 46 =
  15. 15.Double 19 =
  16. 16.Double 56 =
  17. 17.Half of 44 =
  18. 18.Half of 120 =
  19. 19.Double 81 =
  20. 20.Half of 66 =
  21. 21.Double 68 =
  22. 22.Half of 98 =
  23. 23.Half of 150 =
  24. 24.Half of 72 =
  25. 25.Double 76 =
  26. 26.Half of 164 =
  27. 27.Double 17 =
  28. 28.Double 75 =
  29. 29.Half of 184 =
  30. 30.Double 34 =
  31. 31.Double 71 =
  32. 32.Half of 54 =
  33. 33.Double 31 =
  34. 34.Double 28 =
  35. 35.Half of 148 =
  36. 36.Double 99 =
  37. 37.Half of 68 =
  38. 38.Double 52 =
  39. 39.Half of 168 =
  40. 40.Half of 114 =

Answer key

  1. 61
  2. 30
  3. 46
  4. 126
  5. 17
  6. 78
  7. 56
  8. 51
  9. 87
  10. 194
  11. 170
  12. 102
  13. 88
  14. 92
  15. 38
  16. 112
  17. 22
  18. 60
  19. 162
  20. 33
  21. 136
  22. 49
  23. 75
  24. 36
  25. 152
  26. 82
  27. 34
  28. 150
  29. 92
  30. 68
  31. 142
  32. 27
  33. 62
  34. 56
  35. 74
  36. 198
  37. 34
  38. 104
  39. 84
  40. 57

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