Subtract 75/54 from 7/15, Solve 7/15

Subtract 75/54 from 7/15

1^st number: 7/15, 2^nd number: 1 21/54

7/15 - 75/54 is -83/90.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270

Next, find the equivalent fraction of both fractional numbers with denominator 270
For the 1st fraction, since 15 × 18 = 270,
7/15 = 7 × 18/15 × 18 = 126/270
Likewise, for the 2nd fraction, since 54 × 5 = 270,
75/54 = 75 × 5/54 × 5 = 375/270
Subtract the two like fractions:
126/270 - 375/270 = 126 - 375/270 = -249/270
After reducing the fraction, the answer is -83/90

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