Add 5/21 and 28/80
5/21 + 28/80 is 247/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
5/21 = 5 × 80/21 × 80 = 400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
28/80 = 28 × 21/80 × 21 = 588/1680 - Add the two like fractions:
400/1680 + 588/1680 = 400 + 588/1680 = 988/1680 - 988/1680 simplified gives 247/420
- So, 5/21 + 28/80 = 247/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+28/80 5/21+56/80 5/42+28/80 15/21+28/80 5/21+84/80 5/63+28/80 25/21+28/80 35/21+28/80