Add 20/90 and 7/80
20/90 + 7/80 is 223/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
20/90 = 20 × 8/90 × 8 = 160/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
7/80 = 7 × 9/80 × 9 = 63/720 - Add the two like fractions:
160/720 + 63/720 = 160 + 63/720 = 223/720 - So, 20/90 + 7/80 = 223/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+7/80 20/90+14/80 60/90+7/80 20/90+21/80 20/90+35/80 20/90+49/80