Subtract 15/80 from 90/21
1st number: 4 6/21, 2nd number: 15/80
90/21 - 15/80 is 459/112.
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,
15/80 = 15 × 21/80 × 21 = 315/1680 - Subtract the two like fractions:
7200/1680 - 315/1680 = 7200 - 315/1680 = 6885/1680 - After reducing the fraction, the answer is 459/112
- In mixed form: 411/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-30/80 90/42-15/80 90/21-45/80 90/63-15/80 90/21-75/80