Adding and Subtracting Fractions with unlike denominators

Front

What is the least common multiple of 9 and 3?

Back

18

Front

What is the common denominator for 4/9 and 1/3?

Back

9

Front

What is the least common multiple of 6 and 12?

Back

30

Front

Common denominator for 3/10 and 2/6?

Back

20

Front

3/10 + 2/6

Back

19/30

Front

What is the least common multiple of 6 and 12?

Back

30

Front

Common denominator for 5/6 and 3/12?

Back

12

Front

5/6 - 3/12

Back

2/3

Front

Common denominator for 9/10 and 2/4?

Back

20