Add 21/3 and 4/8
1st number: 7 0/3, 2nd number: 4/8
21/3 + 4/8 is 15/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 3 × 8 = 24,
21/3 = 21 × 8/3 × 8 = 168/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
4/8 = 4 × 3/8 × 3 = 12/24 - Add the two like fractions:
168/24 + 12/24 = 168 + 12/24 = 180/24 - 180/24 simplified gives 15/2
- So, 21/3 + 4/8 = 15/2
In mixed form: 71/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+4/8 21/6+4/8 21/3+4/16 63/3+4/8 21/3+12/8 21/9+4/8 21/3+4/24 21/3+20/8 21/15+4/8 21/3+4/40 21/3+28/8 21/3+4/56