Add 21/8 and 84/63
1st number: 2 5/8, 2nd number: 1 21/63
21/8 + 84/63 is 95/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 8 × 63 = 504,
21/8 = 21 × 63/8 × 63 = 1323/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
84/63 = 84 × 8/63 × 8 = 672/504 - Add the two like fractions:
1323/504 + 672/504 = 1323 + 672/504 = 1995/504 - 1995/504 simplified gives 95/24
- So, 21/8 + 84/63 = 95/24
In mixed form: 323/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+84/63 21/16+84/63 63/8+84/63 21/24+84/63 21/40+84/63 21/56+84/63