Add 18/72 and 20/80
18/72 + 20/80 is 1/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
18/72 = 18 × 10/72 × 10 = 180/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Add the two like fractions:
180/720 + 180/720 = 180 + 180/720 = 360/720 - 360/720 simplified gives 1/2
- So, 18/72 + 20/80 = 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72+20/80 18/72+40/80 54/72+20/80 18/72+60/80 90/72+20/80