Subtract 2/21 from 25/27
25/27 - 2/21 is 157/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
25/27 = 25 × 7/27 × 7 = 175/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
2/21 = 2 × 9/21 × 9 = 18/189 - Subtract the two like fractions:
175/189 - 18/189 = 175 - 18/189 = 157/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/27-2/21 25/27-4/21 25/54-2/21 25/27-2/42 75/27-2/21 25/27-6/21 25/81-2/21 25/27-2/63 25/27-10/21 25/27-14/21