Add 21/5 and 80/63
1st number: 4 1/5, 2nd number: 1 17/63
21/5 + 80/63 is 1723/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 5 × 63 = 315,
21/5 = 21 × 63/5 × 63 = 1323/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
80/63 = 80 × 5/63 × 5 = 400/315 - Add the two like fractions:
1323/315 + 400/315 = 1323 + 400/315 = 1723/315 - So, 21/5 + 80/63 = 1723/315
In mixed form: 5148/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+80/63 21/10+80/63 63/5+80/63 21/15+80/63 21/25+80/63 21/35+80/63