Subtract 81/70 from 20/9
1st number: 2 2/9, 2nd number: 1 11/70
20/9 - 81/70 is 671/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
20/9 = 20 × 70/9 × 70 = 1400/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Subtract the two like fractions:
1400/630 - 729/630 = 1400 - 729/630 = 671/630 - In mixed form: 141/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9-81/70 20/18-81/70 60/9-81/70 20/27-81/70 20/45-81/70 20/63-81/70