Subtract 72/21 from 27/80
1st number: 27/80, 2nd number: 3 9/21
27/80 - 72/21 is -1731/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
27/80 = 27 × 21/80 × 21 = 567/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
72/21 = 72 × 80/21 × 80 = 5760/1680 - Subtract the two like fractions:
567/1680 - 5760/1680 = 567 - 5760/1680 = -5193/1680 - After reducing the fraction, the answer is -1731/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80-72/21 27/80-72/42 81/80-72/21 27/80-72/63