Subtract 42/9 from 72/63
1st number: 1 9/63, 2nd number: 4 6/9
72/63 - 42/9 is -74/21.
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,
72/63 = 72 × 1/63 × 1 = 72/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Subtract the two like fractions:
72/63 - 294/63 = 72 - 294/63 = -222/63 - After reducing the fraction, the answer is -74/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/63-84/9 72/63-42/18 72/63-42/27 72/63-42/45 72/63-42/63