Add 98/15 and 21/63, Solve 6 8/15 + 21/63 as a fraction

Add 98/15 and 21/63

1^st number: 6 8/15, 2^nd number: 21/63

98/15 + 21/63 is 103/15.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 63 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 15 × 21 = 315,
98/15 = 98 × 21/15 × 21 = 2058/315
Likewise, for the 2nd fraction, since 63 × 5 = 315,
21/63 = 21 × 5/63 × 5 = 105/315
Add the two like fractions:
2058/315 + 105/315 = 2058 + 105/315 = 2163/315
2163/315 simplified gives 103/15
So, 98/15 + 21/63 = 103/15
In mixed form: 613/15

MathStep (Works offline)

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