Add 18/45 and 20/80
18/45 + 20/80 is 13/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
18/45 = 18 × 16/45 × 16 = 288/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Add the two like fractions:
288/720 + 180/720 = 288 + 180/720 = 468/720 - 468/720 simplified gives 13/20
- So, 18/45 + 20/80 = 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45+20/80 18/45+40/80 18/90+20/80 54/45+20/80 18/45+60/80 90/45+20/80