Add 15/80 and 20/18
1st number: 15/80, 2nd number: 1 2/18
15/80 + 20/18 is 187/144.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
15/80 = 15 × 9/80 × 9 = 135/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
20/18 = 20 × 40/18 × 40 = 800/720 - Add the two like fractions:
135/720 + 800/720 = 135 + 800/720 = 935/720 - 935/720 simplified gives 187/144
- So, 15/80 + 20/18 = 187/144
In mixed form: 143/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/80+20/18 15/80+40/18 15/80+20/36 45/80+20/18 15/80+60/18 15/80+20/54 75/80+20/18 15/80+20/90