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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 167 · 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 166 =
  2. 2.Half of 116 =
  3. 3.Double 97 =
  4. 4.Double 41 =
  5. 5.Half of 44 =
  6. 6.Double 36 =
  7. 7.Half of 160 =
  8. 8.Double 87 =
  9. 9.Double 31 =
  10. 10.Half of 82 =
  11. 11.Double 19 =
  12. 12.Half of 32 =
  13. 13.Double 28 =
  14. 14.Double 69 =
  15. 15.Half of 88 =
  16. 16.Half of 146 =
  17. 17.Double 17 =
  18. 18.Half of 164 =
  19. 19.Half of 172 =
  20. 20.Half of 178 =
  21. 21.Double 51 =
  22. 22.Half of 194 =
  23. 23.Half of 186 =
  24. 24.Double 56 =
  25. 25.Double 64 =
  26. 26.Double 61 =
  27. 27.Half of 198 =
  28. 28.Double 67 =
  29. 29.Double 32 =
  30. 30.Double 89 =
  31. 31.Half of 114 =
  32. 32.Double 98 =
  33. 33.Half of 80 =
  34. 34.Half of 138 =
  35. 35.Half of 70 =
  36. 36.Half of 174 =
  37. 37.Half of 30 =
  38. 38.Double 76 =
  39. 39.Double 55 =
  40. 40.Half of 120 =

Answer key

  1. 83
  2. 58
  3. 194
  4. 82
  5. 22
  6. 72
  7. 80
  8. 174
  9. 62
  10. 41
  11. 38
  12. 16
  13. 56
  14. 138
  15. 44
  16. 73
  17. 34
  18. 82
  19. 86
  20. 89
  21. 102
  22. 97
  23. 93
  24. 112
  25. 128
  26. 122
  27. 99
  28. 134
  29. 64
  30. 178
  31. 57
  32. 196
  33. 40
  34. 69
  35. 35
  36. 87
  37. 15
  38. 152
  39. 110
  40. 60

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