Subtract 8/70 from 21/10
1st number: 2 1/10, 2nd number: 8/70
21/10 - 8/70 is 139/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
8/70 = 8 × 1/70 × 1 = 8/70 - Subtract the two like fractions:
147/70 - 8/70 = 147 - 8/70 = 139/70 - In mixed form: 169/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-8/70 21/10-16/70 21/20-8/70 63/10-8/70 21/10-24/70 21/30-8/70 21/10-40/70 21/50-8/70 21/10-56/70 21/70-8/70