Subtract 30/9 from 90/63
1st number: 1 27/63, 2nd number: 3 3/9
90/63 - 30/9 is -40/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
90/63 = 90 × 1/63 × 1 = 90/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
30/9 = 30 × 7/9 × 7 = 210/63 - Subtract the two like fractions:
90/63 - 210/63 = 90 - 210/63 = -120/63 - After reducing the fraction, the answer is -40/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/63-60/9 90/63-30/18 90/63-90/9 90/63-30/27 90/63-30/45 90/63-30/63