Add 21/63 and 6/15
21/63 + 6/15 is 11/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
21/63 = 21 × 5/63 × 5 = 105/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
6/15 = 6 × 21/15 × 21 = 126/315 - Add the two like fractions:
105/315 + 126/315 = 105 + 126/315 = 231/315 - 231/315 simplified gives 11/15
- So, 21/63 + 6/15 = 11/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+6/15 21/63+12/15 21/63+6/30 21/63+18/15 21/63+6/45 21/63+30/15 21/63+6/75 21/63+42/15