Subtract 84/80 from 60/42, Solve 1 18/42

Subtract 84/80 from 60/42

1^st number: 1 18/42, 2^nd number: 1 4/80

60/42 - 84/80 is 53/140.

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,
60/42 = 60 × 40/42 × 40 = 2400/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
84/80 = 84 × 21/80 × 21 = 1764/1680
Subtract the two like fractions:
2400/1680 - 1764/1680 = 2400 - 1764/1680 = 636/1680
After reducing the fraction, the answer is 53/140

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