Add 15/35 and 21/63
15/35 + 21/63 is 16/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 35 × 9 = 315,
15/35 = 15 × 9/35 × 9 = 135/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
21/63 = 21 × 5/63 × 5 = 105/315 - Add the two like fractions:
135/315 + 105/315 = 135 + 105/315 = 240/315 - 240/315 simplified gives 16/21
- So, 15/35 + 21/63 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35+21/63 15/35+42/63 15/70+21/63 45/35+21/63 75/35+21/63