Subtract 20/9 from 30/70
1st number: 30/70, 2nd number: 2 2/9
30/70 - 20/9 is -113/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 9 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
30/70 = 30 × 9/70 × 9 = 270/630 - Likewise, for the 2nd fraction, since 9 × 70 = 630,
20/9 = 20 × 70/9 × 70 = 1400/630 - Subtract the two like fractions:
270/630 - 1400/630 = 270 - 1400/630 = -1130/630 - After reducing the fraction, the answer is -113/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70-20/9 30/70-40/9 30/70-20/18 90/70-20/9 30/70-60/9 30/70-20/27 30/70-20/45 30/70-20/63