Add 40/63 and 21/8
1st number: 40/63, 2nd number: 2 5/8
40/63 + 21/8 is 1643/504.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 8 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 63 × 8 = 504,
40/63 = 40 × 8/63 × 8 = 320/504 - Likewise, for the 2nd fraction, since 8 × 63 = 504,
21/8 = 21 × 63/8 × 63 = 1323/504 - Add the two like fractions:
320/504 + 1323/504 = 320 + 1323/504 = 1643/504 - So, 40/63 + 21/8 = 1643/504
In mixed form: 3131/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/63+21/8 40/63+42/8 40/63+21/16 40/63+63/8 40/63+21/24 40/63+21/40 40/63+21/56