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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 688 · 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 22 =
  2. 2.Half of 168 =
  3. 3.Half of 156 =
  4. 4.Double 96 =
  5. 5.Double 81 =
  6. 6.Double 97 =
  7. 7.Half of 58 =
  8. 8.Half of 132 =
  9. 9.Double 76 =
  10. 10.Double 26 =
  11. 11.Half of 44 =
  12. 12.Half of 80 =
  13. 13.Half of 34 =
  14. 14.Double 49 =
  15. 15.Half of 54 =
  16. 16.Double 61 =
  17. 17.Half of 148 =
  18. 18.Half of 50 =
  19. 19.Half of 126 =
  20. 20.Double 27 =
  21. 21.Double 51 =
  22. 22.Double 41 =
  23. 23.Double 85 =
  24. 24.Double 37 =
  25. 25.Double 71 =
  26. 26.Double 36 =
  27. 27.Double 58 =
  28. 28.Half of 158 =
  29. 29.Half of 114 =
  30. 30.Half of 104 =
  31. 31.Half of 164 =
  32. 32.Double 77 =
  33. 33.Half of 122 =
  34. 34.Half of 184 =
  35. 35.Half of 68 =
  36. 36.Double 33 =
  37. 37.Half of 160 =
  38. 38.Half of 60 =
  39. 39.Double 29 =
  40. 40.Double 21 =

Answer key

  1. 44
  2. 84
  3. 78
  4. 192
  5. 162
  6. 194
  7. 29
  8. 66
  9. 152
  10. 52
  11. 22
  12. 40
  13. 17
  14. 98
  15. 27
  16. 122
  17. 74
  18. 25
  19. 63
  20. 54
  21. 102
  22. 82
  23. 170
  24. 74
  25. 142
  26. 72
  27. 116
  28. 79
  29. 57
  30. 52
  31. 82
  32. 154
  33. 61
  34. 92
  35. 34
  36. 66
  37. 80
  38. 30
  39. 58
  40. 42

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