Subtract 42/80 from 50/42, Solve 1 8/42

Subtract 42/80 from 50/42

1^st number: 1 8/42, 2^nd number: 42/80

50/42 - 42/80 is 559/840.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 42 × 40 = 1680,
50/42 = 50 × 40/42 × 40 = 2000/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
42/80 = 42 × 21/80 × 21 = 882/1680
Subtract the two like fractions:
2000/1680 - 882/1680 = 2000 - 882/1680 = 1118/1680
After reducing the fraction, the answer is 559/840

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