Subtract 50/54 from 21/30
21/30 - 50/54 is -61/270.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 30 × 9 = 270,
21/30 = 21 × 9/30 × 9 = 189/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
50/54 = 50 × 5/54 × 5 = 250/270 - Subtract the two like fractions:
189/270 - 250/270 = 189 - 250/270 = -61/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-50/54 21/60-50/54 63/30-50/54 21/90-50/54