Subtract 25/7 from 45/54, Solve 45/54

Subtract 25/7 from 45/54

1^st number: 45/54, 2^nd number: 3 4/7

45/54 - 25/7 is -115/42.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 7 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 54 × 7 = 378,
45/54 = 45 × 7/54 × 7 = 315/378
Likewise, for the 2nd fraction, since 7 × 54 = 378,
25/7 = 25 × 54/7 × 54 = 1350/378
Subtract the two like fractions:
315/378 - 1350/378 = 315 - 1350/378 = -1035/378
After reducing the fraction, the answer is -115/42

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad