Add 21/5 and 30/8
1st number: 4 1/5, 2nd number: 3 6/8
21/5 + 30/8 is 159/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
21/5 = 21 × 8/5 × 8 = 168/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
30/8 = 30 × 5/8 × 5 = 150/40 - Add the two like fractions:
168/40 + 150/40 = 168 + 150/40 = 318/40 - 318/40 simplified gives 159/20
- So, 21/5 + 30/8 = 159/20
In mixed form: 719/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+30/8 21/5+60/8 21/10+30/8 21/5+30/16 63/5+30/8 21/5+90/8 21/15+30/8 21/5+30/24 21/25+30/8 21/5+30/40 21/35+30/8 21/5+30/56