Add 15/80 and 72/90
15/80 + 72/90 is 79/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 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 90 × 8 = 720,
72/90 = 72 × 8/90 × 8 = 576/720 - Add the two like fractions:
135/720 + 576/720 = 135 + 576/720 = 711/720 - 711/720 simplified gives 79/80
- So, 15/80 + 72/90 = 79/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/80+72/90 45/80+72/90 75/80+72/90