Subtract 5/21 from 90/9
1st number: 10 0/9, 2nd number: 5/21
90/9 - 5/21 is 205/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
90/9 = 90 × 7/9 × 7 = 630/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63 - Subtract the two like fractions:
630/63 - 15/63 = 630 - 15/63 = 615/63 - After reducing the fraction, the answer is 205/21
- In mixed form: 916/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/9-10/21 90/18-5/21 90/9-5/42 90/9-15/21 90/27-5/21 90/9-5/63 90/9-25/21 90/45-5/21 90/9-35/21 90/63-5/21