Add 30/80 and 50/90
30/80 + 50/90 is 67/72.
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,
30/80 = 30 × 9/80 × 9 = 270/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
50/90 = 50 × 8/90 × 8 = 400/720 - Add the two like fractions:
270/720 + 400/720 = 270 + 400/720 = 670/720 - 670/720 simplified gives 67/72
- So, 30/80 + 50/90 = 67/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+50/90 90/80+50/90