1. Which of the following is a common denominator for 1 / 2 and 2 / 5 ?
    1.   2
    2.   5
    3.   12
    4.   10
  2. Which of the following is a common denominator for 2 / 3 and 2 / 6 ?
    1.   3
    2.   2
    3.   4
    4.   6
  3. Which of the following is a common denominator for 1 / 3 and 1 / 4 ?
    1.   8
    2.   12
    3.   4
    4.   10
  4. Which of the following is a common denominator for 5 / 6 and 1 / 3 ?
    1.   6
    2.   10
    3.   3
    4.   9
  5. Which of the following is a common denominator for 3 / 4 and 2 / 5 ?
    1.   10
    2.   20
    3.   30
    4.   12
  6. Which of the following is a common denominator for 1 / 6 and 1 / 4 ?
    1.   10
    2.   12
    3.   18
    4.   20
  7. Which of the following is a common denominator for 3 / 8 and 2 / 3 ?
    1.   16
    2.   12
    3.   15
    4.   24
  8. Which of the following is a common denominator for 1 / 10 and 1/4 ?
    1.   20
    2.   30
    3.   10
    4.   15
  9. Which of the following is a common denominator for 1 / 7 and 2 / 3 ?
    1.   12
    2.   21
    3.   14
    4.   28
  10. Which of the following is a common denominator for 5 / 8 and 3 / 7 ?
    1.   24
    2.   32
    3.   49
    4.   56
  11. Which of the following is a common denominator for 4 / 5 and 5 / 6 ?
    1.   10
    2.   20
    3.   30
    4.   40
  12. Which of the following is a common denominator for 4 / 9 and 5 / 6 ?
    1.   12
    2.   24
    3.   18
    4.   30