Subtract 18/9 from 48/42, Solve 1 6/42

Subtract 18/9 from 48/42

1^st number: 1 6/42, 2^nd number: 2 0/9

48/42 - 18/9 is -6/7.

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

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
48/42 = 48 × 3/42 × 3 = 144/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
18/9 = 18 × 14/9 × 14 = 252/126
Subtract the two like fractions:
144/126 - 252/126 = 144 - 252/126 = -108/126
After reducing the fraction, the answer is -6/7

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