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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 717 · 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 184 =
  2. 2.Half of 122 =
  3. 3.Double 99 =
  4. 4.Half of 56 =
  5. 5.Double 56 =
  6. 6.Double 71 =
  7. 7.Double 72 =
  8. 8.Double 61 =
  9. 9.Double 67 =
  10. 10.Double 38 =
  11. 11.Double 97 =
  12. 12.Double 41 =
  13. 13.Double 36 =
  14. 14.Double 39 =
  15. 15.Double 51 =
  16. 16.Double 76 =
  17. 17.Double 21 =
  18. 18.Double 27 =
  19. 19.Half of 144 =
  20. 20.Double 64 =
  21. 21.Half of 98 =
  22. 22.Half of 92 =
  23. 23.Double 93 =
  24. 24.Double 57 =
  25. 25.Half of 194 =
  26. 26.Double 46 =
  27. 27.Half of 110 =
  28. 28.Half of 78 =
  29. 29.Half of 28 =
  30. 30.Double 45 =
  31. 31.Half of 26 =
  32. 32.Half of 174 =
  33. 33.Half of 76 =
  34. 34.Double 53 =
  35. 35.Half of 48 =
  36. 36.Double 26 =
  37. 37.Double 52 =
  38. 38.Half of 82 =
  39. 39.Double 87 =
  40. 40.Half of 112 =

Answer key

  1. 92
  2. 61
  3. 198
  4. 28
  5. 112
  6. 142
  7. 144
  8. 122
  9. 134
  10. 76
  11. 194
  12. 82
  13. 72
  14. 78
  15. 102
  16. 152
  17. 42
  18. 54
  19. 72
  20. 128
  21. 49
  22. 46
  23. 186
  24. 114
  25. 97
  26. 92
  27. 55
  28. 39
  29. 14
  30. 90
  31. 13
  32. 87
  33. 38
  34. 106
  35. 24
  36. 52
  37. 104
  38. 41
  39. 174
  40. 56

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