Adding Fractions with Unlike Denominators

Front

Back

17/20

Front

Back

5/6

Front

Common denominator for 1/5 and 5/6? Options: 30, 11, 6, 5

Back

30

Front

Which of these numbers could NOT be a common denominator for these two fractions?
1/6   and   1/4
Options: 12, 18, 24, 36

Back

18

Front

Back

22/20

Front

Back

5/9

Front

3/8 + 2/4 =

Back

7/8

Front

2/6 + 1/2 =

Back

5/6

Front

1/4 + 3/8 =

Back

5/8

Front

4/8 + 1/3 =

Back

20/24