Subtract 7/70 from 21/9
1st number: 2 3/9, 2nd number: 7/70
21/9 - 7/70 is 67/30.
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,
21/9 = 21 × 70/9 × 70 = 1470/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
7/70 = 7 × 9/70 × 9 = 63/630 - Subtract the two like fractions:
1470/630 - 63/630 = 1470 - 63/630 = 1407/630 - After reducing the fraction, the answer is 67/30
- In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9-7/70 21/9-14/70 21/18-7/70 63/9-7/70 21/9-21/70 21/27-7/70 21/9-35/70 21/45-7/70 21/9-49/70 21/63-7/70