Subtract 6/80 from 90/21
1st number: 4 6/21, 2nd number: 6/80
90/21 - 6/80 is 1179/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
90/21 = 90 × 80/21 × 80 = 7200/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
6/80 = 6 × 21/80 × 21 = 126/1680 - Subtract the two like fractions:
7200/1680 - 126/1680 = 7200 - 126/1680 = 7074/1680 - After reducing the fraction, the answer is 1179/280
- In mixed form: 459/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-12/80 90/42-6/80 90/21-18/80 90/63-6/80 90/21-30/80 90/21-42/80