Subtract 1/21 from 25/27
25/27 - 1/21 is 166/189.
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,
1/21 = 1 × 9/21 × 9 = 9/189 - Subtract the two like fractions:
175/189 - 9/189 = 175 - 9/189 = 166/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/27-1/21 25/27-2/21 25/54-1/21 25/27-1/42 75/27-1/21 25/27-3/21 25/81-1/21 25/27-1/63 25/27-5/21 25/27-7/21