Add 21/5 and 28/10
1st number: 4 1/5, 2nd number: 2 8/10
21/5 + 28/10 is 7/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 10 is 10
Next, find the equivalent fraction of both fractional numbers with denominator 10 - For the 1st fraction, since 5 × 2 = 10,
21/5 = 21 × 2/5 × 2 = 42/10 - Likewise, for the 2nd fraction, since 10 × 1 = 10,
28/10 = 28 × 1/10 × 1 = 28/10 - Add the two like fractions:
42/10 + 28/10 = 42 + 28/10 = 70/10 - 70/10 simplified gives 7/1
- So, 21/5 + 28/10 = 7/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+28/10 21/5+56/10 21/10+28/10 21/5+28/20 63/5+28/10 21/5+84/10 21/15+28/10 21/5+28/30 21/25+28/10 21/5+28/50 21/35+28/10 21/5+28/70