Subtract 90/54 from 21/20
1st number: 1 1/20, 2nd number: 1 36/54
21/20 - 90/54 is -37/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 54 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 20 × 27 = 540,
21/20 = 21 × 27/20 × 27 = 567/540 - Likewise, for the 2nd fraction, since 54 × 10 = 540,
90/54 = 90 × 10/54 × 10 = 900/540 - Subtract the two like fractions:
567/540 - 900/540 = 567 - 900/540 = -333/540 - After reducing the fraction, the answer is -37/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-90/54 21/40-90/54 63/20-90/54 21/60-90/54