Add 20/80 and 30/45
20/80 + 30/45 is 11/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
30/45 = 30 × 16/45 × 16 = 480/720 - Add the two like fractions:
180/720 + 480/720 = 180 + 480/720 = 660/720 - 660/720 simplified gives 11/12
- So, 20/80 + 30/45 = 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+30/45 20/80+60/45 20/80+30/90 60/80+30/45 20/80+90/45