Subtract 27/90 from 45/42, Solve 1 3/42

Subtract 27/90 from 45/42

1^st number: 1 3/42, 2^nd number: 27/90

45/42 - 27/90 is 27/35.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 42 × 15 = 630,
45/42 = 45 × 15/42 × 15 = 675/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
27/90 = 27 × 7/90 × 7 = 189/630
Subtract the two like fractions:
675/630 - 189/630 = 675 - 189/630 = 486/630
After reducing the fraction, the answer is 27/35

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