Subtract 12/27 from 90/21
1st number: 4 6/21, 2nd number: 12/27
90/21 - 12/27 is 242/63.
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,
90/21 = 90 × 9/21 × 9 = 810/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189 - Subtract the two like fractions:
810/189 - 84/189 = 810 - 84/189 = 726/189 - After reducing the fraction, the answer is 242/63
- In mixed form: 353/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-24/27 90/42-12/27 90/21-12/54 90/21-36/27 90/63-12/27 90/21-12/81 90/21-60/27 90/21-84/27