Subtract 5/81 from 90/42, Solve 2 6/42

Subtract 5/81 from 90/42

1^st number: 2 6/42, 2^nd number: 5/81

90/42 - 5/81 is 1180/567.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134

Next, find the equivalent fraction of both fractional numbers with denominator 1134
For the 1st fraction, since 42 × 27 = 1134,
90/42 = 90 × 27/42 × 27 = 2430/1134
Likewise, for the 2nd fraction, since 81 × 14 = 1134,
5/81 = 5 × 14/81 × 14 = 70/1134
Subtract the two like fractions:
2430/1134 - 70/1134 = 2430 - 70/1134 = 2360/1134
After reducing the fraction, the answer is 1180/567
In mixed form: 246/567

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