Subtract 1/30 from 30/21
1st number: 1 9/21, 2nd number: 1/30
30/21 - 1/30 is 293/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
30/21 = 30 × 10/21 × 10 = 300/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
1/30 = 1 × 7/30 × 7 = 7/210 - Subtract the two like fractions:
300/210 - 7/210 = 300 - 7/210 = 293/210 - In mixed form: 183/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-1/30 30/21-2/30 30/42-1/30 30/21-1/60 90/21-1/30 30/21-3/30 30/63-1/30 30/21-1/90 30/21-5/30 30/21-7/30