Subtract 20/70 from 30/9
1st number: 3 3/9, 2nd number: 20/70
30/9 - 20/70 is 64/21.
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,
30/9 = 30 × 70/9 × 70 = 2100/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
20/70 = 20 × 9/70 × 9 = 180/630 - Subtract the two like fractions:
2100/630 - 180/630 = 2100 - 180/630 = 1920/630 - After reducing the fraction, the answer is 64/21
- In mixed form: 31/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9-20/70 30/9-40/70 30/18-20/70 90/9-20/70 30/9-60/70 30/27-20/70 30/45-20/70 30/63-20/70