Subtract 25/18 from 90/21
1st number: 4 6/21, 2nd number: 1 7/18
90/21 - 25/18 is 365/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
90/21 = 90 × 6/21 × 6 = 540/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
25/18 = 25 × 7/18 × 7 = 175/126 - Subtract the two like fractions:
540/126 - 175/126 = 540 - 175/126 = 365/126 - In mixed form: 2113/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-50/18 90/42-25/18 90/21-25/36 90/21-75/18 90/63-25/18 90/21-25/54 90/21-25/90