Add 10/21 and 63/8
1st number: 10/21, 2nd number: 7 7/8
10/21 + 63/8 is 1403/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
10/21 = 10 × 8/21 × 8 = 80/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Add the two like fractions:
80/168 + 1323/168 = 80 + 1323/168 = 1403/168 - So, 10/21 + 63/8 = 1403/168
In mixed form: 859/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+63/8 10/42+63/8 10/21+63/16 30/21+63/8 10/63+63/8 10/21+63/24 50/21+63/8 10/21+63/40 70/21+63/8 10/21+63/56