Subtract 72/42 from 7/9, Solve 7/9 - 1 30/42 as a fraction

Subtract 72/42 from 7/9

1^st number: 7/9, 2^nd number: 1 30/42

7/9 - 72/42 is -59/63.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 42 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 9 × 14 = 126,
7/9 = 7 × 14/9 × 14 = 98/126
Likewise, for the 2nd fraction, since 42 × 3 = 126,
72/42 = 72 × 3/42 × 3 = 216/126
Subtract the two like fractions:
98/126 - 216/126 = 98 - 216/126 = -118/126
After reducing the fraction, the answer is -59/63

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