Add 20/72 and 21/98
20/72 + 21/98 is 31/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 98 is 3528
Next, find the equivalent fraction of both fractional numbers with denominator 3528 - For the 1st fraction, since 72 × 49 = 3528,
20/72 = 20 × 49/72 × 49 = 980/3528 - Likewise, for the 2nd fraction, since 98 × 36 = 3528,
21/98 = 21 × 36/98 × 36 = 756/3528 - Add the two like fractions:
980/3528 + 756/3528 = 980 + 756/3528 = 1736/3528 - 1736/3528 simplified gives 31/63
- So, 20/72 + 21/98 = 31/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72+21/98 20/72+42/98 60/72+21/98 20/72+63/98