Subtract 90/21 from 27/80
1st number: 27/80, 2nd number: 4 6/21
27/80 - 90/21 is -2211/560.
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,
90/21 = 90 × 80/21 × 80 = 7200/1680 - Subtract the two like fractions:
567/1680 - 7200/1680 = 567 - 7200/1680 = -6633/1680 - After reducing the fraction, the answer is -2211/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80-90/21 27/80-90/42 81/80-90/21 27/80-90/63