Add 63/8 and 63/21
1st number: 7 7/8, 2nd number: 3 0/21
63/8 + 63/21 is 87/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
63/21 = 63 × 8/21 × 8 = 504/168 - Add the two like fractions:
1323/168 + 504/168 = 1323 + 504/168 = 1827/168 - 1827/168 simplified gives 87/8
- So, 63/8 + 63/21 = 87/8
In mixed form: 107/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/16+63/21 63/8+63/42 63/24+63/21 63/40+63/21 63/56+63/21