Subtract 21/27 from 30/21
1st number: 1 9/21, 2nd number: 21/27
30/21 - 21/27 is 41/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
30/21 = 30 × 9/21 × 9 = 270/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
21/27 = 21 × 7/27 × 7 = 147/189 - Subtract the two like fractions:
270/189 - 147/189 = 270 - 147/189 = 123/189 - After reducing the fraction, the answer is 41/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-21/27 30/21-42/27 30/42-21/27 30/21-21/54 90/21-21/27 30/21-63/27 30/63-21/27 30/21-21/81