Subtract 10/63 from 90/81
1st number: 1 9/81, 2nd number: 10/63
90/81 - 10/63 is 20/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 63 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
90/81 = 90 × 7/81 × 7 = 630/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
10/63 = 10 × 9/63 × 9 = 90/567 - Subtract the two like fractions:
630/567 - 90/567 = 630 - 90/567 = 540/567 - After reducing the fraction, the answer is 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81-20/63 90/81-30/63 90/81-50/63 90/81-70/63