Add 6/90 and 42/80
6/90 + 42/80 is 71/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
6/90 = 6 × 8/90 × 8 = 48/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Add the two like fractions:
48/720 + 378/720 = 48 + 378/720 = 426/720 - 426/720 simplified gives 71/120
- So, 6/90 + 42/80 = 71/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90+42/80 6/90+84/80 18/90+42/80 30/90+42/80 42/90+42/80