Add 20/90 and 10/80
20/90 + 10/80 is 25/72.
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,
10/80 = 10 × 9/80 × 9 = 90/720 - Add the two like fractions:
160/720 + 90/720 = 160 + 90/720 = 250/720 - 250/720 simplified gives 25/72
- So, 20/90 + 10/80 = 25/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+10/80 20/90+20/80 60/90+10/80 20/90+30/80 20/90+50/80 20/90+70/80