Subtract 15/63 from 90/18
1st number: 5 0/18, 2nd number: 15/63
90/18 - 15/63 is 100/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
15/63 = 15 × 2/63 × 2 = 30/126 - Subtract the two like fractions:
630/126 - 30/126 = 630 - 30/126 = 600/126 - After reducing the fraction, the answer is 100/21
- In mixed form: 416/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18-30/63 90/36-15/63 90/18-45/63 90/54-15/63 90/18-75/63