Subtract 21/45 from 18/27
18/27 - 21/45 is 1/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 45 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 27 × 5 = 135,
18/27 = 18 × 5/27 × 5 = 90/135 - Likewise, for the 2nd fraction, since 45 × 3 = 135,
21/45 = 21 × 3/45 × 3 = 63/135 - Subtract the two like fractions:
90/135 - 63/135 = 90 - 63/135 = 27/135 - After reducing the fraction, the answer is 1/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27-21/45 18/27-42/45 18/54-21/45 18/27-21/90 54/27-21/45 18/27-63/45 18/81-21/45 90/27-21/45