Add 5/21 and 18/80
5/21 + 18/80 is 389/840.
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,
18/80 = 18 × 21/80 × 21 = 378/1680 - Add the two like fractions:
400/1680 + 378/1680 = 400 + 378/1680 = 778/1680 - 778/1680 simplified gives 389/840
- So, 5/21 + 18/80 = 389/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+18/80 5/21+36/80 5/42+18/80 15/21+18/80 5/21+54/80 5/63+18/80 25/21+18/80 5/21+90/80 35/21+18/80