Add 90/80 and 42/90
1st number: 1 10/80, 2nd number: 42/90
90/80 + 42/90 is 191/120.
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,
90/80 = 90 × 9/80 × 9 = 810/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
42/90 = 42 × 8/90 × 8 = 336/720 - Add the two like fractions:
810/720 + 336/720 = 810 + 336/720 = 1146/720 - 1146/720 simplified gives 191/120
- So, 90/80 + 42/90 = 191/120
In mixed form: 171/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+84/90