Subtract 21/80 from 70/10
1st number: 7 0/10, 2nd number: 21/80
70/10 - 21/80 is 539/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 10 × 8 = 80,
70/10 = 70 × 8/10 × 8 = 560/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Subtract the two like fractions:
560/80 - 21/80 = 560 - 21/80 = 539/80 - In mixed form: 659/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/10-42/80 70/20-21/80 70/10-63/80 70/30-21/80 70/50-21/80