Add 21/81 and 72/98
21/81 + 72/98 is 1315/1323.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 98 is 7938
Next, find the equivalent fraction of both fractional numbers with denominator 7938 - For the 1st fraction, since 81 × 98 = 7938,
21/81 = 21 × 98/81 × 98 = 2058/7938 - Likewise, for the 2nd fraction, since 98 × 81 = 7938,
72/98 = 72 × 81/98 × 81 = 5832/7938 - Add the two like fractions:
2058/7938 + 5832/7938 = 2058 + 5832/7938 = 7890/7938 - 7890/7938 simplified gives 1315/1323
- So, 21/81 + 72/98 = 1315/1323
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+72/98 63/81+72/98