Add 30/21 and 63/8
1st number: 1 9/21, 2nd number: 7 7/8
30/21 + 63/8 is 521/56.
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,
30/21 = 30 × 8/21 × 8 = 240/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Add the two like fractions:
240/168 + 1323/168 = 240 + 1323/168 = 1563/168 - 1563/168 simplified gives 521/56
- So, 30/21 + 63/8 = 521/56
In mixed form: 917/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+63/8 30/42+63/8 30/21+63/16 90/21+63/8 30/63+63/8 30/21+63/24 30/21+63/40 30/21+63/56