Subtract 54/45 from 8/42, Solve 8/42

Subtract 54/45 from 8/42

1^st number: 8/42, 2^nd number: 1 9/45

8/42 - 54/45 is -106/105.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 42 × 15 = 630,
8/42 = 8 × 15/42 × 15 = 120/630
Likewise, for the 2nd fraction, since 45 × 14 = 630,
54/45 = 54 × 14/45 × 14 = 756/630
Subtract the two like fractions:
120/630 - 756/630 = 120 - 756/630 = -636/630
After reducing the fraction, the answer is -106/105

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