Add 1/21 and 28/80
1/21 + 28/80 is 167/420.
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,
1/21 = 1 × 80/21 × 80 = 80/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
28/80 = 28 × 21/80 × 21 = 588/1680 - Add the two like fractions:
80/1680 + 588/1680 = 80 + 588/1680 = 668/1680 - 668/1680 simplified gives 167/420
- So, 1/21 + 28/80 = 167/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+28/80 1/21+56/80 1/42+28/80 3/21+28/80 1/21+84/80 1/63+28/80 5/21+28/80 7/21+28/80