4) 19/42+6/7=19/42+6*6/7*6=(19+36)/42=55/42=1+13/42
6) 3/8+1/56=3*7/8*7+1/56=22/56=11/28
2)10/21-1/3=10/21-7/21=3/21=1/7
6)1/3-7/30=10/30-7/30=3/30=1/10
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4) 19/42+6/7=19/42+6*6/7*6=(19+36)/42=55/42=1+13/42
6) 3/8+1/56=3*7/8*7+1/56=22/56=11/28
2)10/21-1/3=10/21-7/21=3/21=1/7
6)1/3-7/30=10/30-7/30=3/30=1/10