Subtract 20/7 from 90/54
1st number: 1 36/54, 2nd number: 2 6/7
90/54 - 20/7 is -25/21.
Steps for subtracting fractions
- 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,
90/54 = 90 × 7/54 × 7 = 630/378 - Likewise, for the 2nd fraction, since 7 × 54 = 378,
20/7 = 20 × 54/7 × 54 = 1080/378 - Subtract the two like fractions:
630/378 - 1080/378 = 630 - 1080/378 = -450/378 - After reducing the fraction, the answer is -25/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54-40/7 90/54-20/14 90/54-60/7 90/54-20/21 90/54-20/35 90/54-20/49