Simplify the following fractions into lowest terms:

4/6 = _____             2/4 = _____                5/7 = _____         3/3 = _____            3/9 = ____

4/8 = _____

Fill in the blank spaces in the following addition problems involving fractions.  (You may leave your answer as an improper fraction, but give your answer in lowest terms.)

1/3 + 1/3 = _____                2/8 + 3/8 = _____            1/2 + 1/3 = _____            1/10 + 3/10 = _____

1/4 + 1/3 = _____                4/6 + 2/3 = _____            2/7 + 4/5 = _____            3/4 + 7/8 = _____

4/9 + 7/8 = _____                2/5 + 2/3 = _____            1/7 + 1/8 = _____            2/3 + 4/3 = _____

2/2 + 1/4 = _____                3/10 + 3/5 = _____          1/2 + 2/3 = _____ 

Extra credit: (Fill in the blanks.)

__/4 + 3/4 = 5/4        1/7 + 1/2 = 9/__        1/3 + 3/4 = 13/__        __/5 + 2/5 = 7/5

3/4 - 1/4 = _____       4/5 - 1/5 = _____      5/4 + 2/7 = _____