Add 30/10 and 21/8
1st number: 3 0/10, 2nd number: 2 5/8
30/10 + 21/8 is 45/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
30/10 = 30 × 4/10 × 4 = 120/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Add the two like fractions:
120/40 + 105/40 = 120 + 105/40 = 225/40 - 225/40 simplified gives 45/8
- So, 30/10 + 21/8 = 45/8
In mixed form: 55/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/10+21/8 30/10+42/8 30/20+21/8 30/10+21/16 90/10+21/8 30/10+63/8 30/10+21/24 30/50+21/8 30/10+21/40 30/70+21/8 30/10+21/56