Subtract 75/63 from 30/21
1st number: 1 9/21, 2nd number: 1 12/63
30/21 - 75/63 is 5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
30/21 = 30 × 3/21 × 3 = 90/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
75/63 = 75 × 1/63 × 1 = 75/63 - Subtract the two like fractions:
90/63 - 75/63 = 90 - 75/63 = 15/63 - After reducing the fraction, the answer is 5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-75/63 30/42-75/63 90/21-75/63 30/63-75/63