Subtract 5/7 from 21/50
21/50 - 5/7 is -103/350.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 7 is 350
Next, find the equivalent fraction of both fractional numbers with denominator 350 - For the 1st fraction, since 50 × 7 = 350,
21/50 = 21 × 7/50 × 7 = 147/350 - Likewise, for the 2nd fraction, since 7 × 50 = 350,
5/7 = 5 × 50/7 × 50 = 250/350 - Subtract the two like fractions:
147/350 - 250/350 = 147 - 250/350 = -103/350
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/50-5/7 21/50-10/7 21/50-5/14 63/50-5/7 21/50-15/7 21/50-5/21 21/50-25/7 21/50-5/35 21/50-35/7 21/50-5/49