Subtract 3/21 from 30/9
1st number: 3 3/9, 2nd number: 3/21
30/9 - 3/21 is 67/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
30/9 = 30 × 7/9 × 7 = 210/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
3/21 = 3 × 3/21 × 3 = 9/63 - Subtract the two like fractions:
210/63 - 9/63 = 210 - 9/63 = 201/63 - After reducing the fraction, the answer is 67/21
- In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9-3/21 30/9-6/21 30/18-3/21 30/9-3/42 90/9-3/21 30/9-9/21 30/27-3/21 30/9-3/63 30/9-15/21 30/45-3/21 30/63-3/21