Answers

Subtract 72/63 from 72/90

1^st number: 72/90, 2^nd number: 1 9/63

72/90 - 72/63 is -12/35.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 63 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   72/90 = 72 × 7/90 × 7 = 504/630
3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
   72/63 = 72 × 10/63 × 10 = 720/630
4. Subtract the two like fractions:
   504/630 - 720/630 = 504 - 720/630 = -216/630
5. After reducing the fraction, the answer is -12/35

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

Subtract Fractions Calculator