Subtract 9/20 from 21/27
21/27 - 9/20 is 59/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 20 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Likewise, for the 2nd fraction, since 20 × 27 = 540,
9/20 = 9 × 27/20 × 27 = 243/540 - Subtract the two like fractions:
420/540 - 243/540 = 420 - 243/540 = 177/540 - After reducing the fraction, the answer is 59/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-9/20 21/27-18/20 21/54-9/20 21/27-9/40 63/27-9/20 21/27-27/20 21/81-9/20 21/27-9/60 21/27-45/20 21/27-63/20