Add 21/35 and 80/63
1st number: 21/35, 2nd number: 1 17/63
21/35 + 80/63 is 589/315.
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,
21/35 = 21 × 9/35 × 9 = 189/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
80/63 = 80 × 5/63 × 5 = 400/315 - Add the two like fractions:
189/315 + 400/315 = 189 + 400/315 = 589/315 - So, 21/35 + 80/63 = 589/315
In mixed form: 1274/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+80/63 21/70+80/63 63/35+80/63