Add 21/80 and 7/18
21/80 + 7/18 is 469/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
7/18 = 7 × 40/18 × 40 = 280/720 - Add the two like fractions:
189/720 + 280/720 = 189 + 280/720 = 469/720 - So, 21/80 + 7/18 = 469/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+7/18 21/80+14/18 21/80+7/36 63/80+7/18 21/80+21/18 21/80+7/54 21/80+35/18 21/80+7/90 21/80+49/18