Add 56/63 and 21/80
56/63 + 21/80 is 829/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 80 is 5040
Next, find the equivalent fraction of both fractional numbers with denominator 5040 - For the 1st fraction, since 63 × 80 = 5040,
56/63 = 56 × 80/63 × 80 = 4480/5040 - Likewise, for the 2nd fraction, since 80 × 63 = 5040,
21/80 = 21 × 63/80 × 63 = 1323/5040 - Add the two like fractions:
4480/5040 + 1323/5040 = 4480 + 1323/5040 = 5803/5040 - 5803/5040 simplified gives 829/720
- So, 56/63 + 21/80 = 829/720
In mixed form: 1109/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63+42/80 56/63+63/80