Subtract 8/70 from 21/50
21/50 - 8/70 is 107/350.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 70 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 70 × 5 = 350,
8/70 = 8 × 5/70 × 5 = 40/350 - Subtract the two like fractions:
147/350 - 40/350 = 147 - 40/350 = 107/350
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/50-8/70 21/50-16/70 63/50-8/70 21/50-24/70 21/50-40/70 21/50-56/70