Add 42/80 and 24/90
42/80 + 24/90 is 19/24.
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,
42/80 = 42 × 9/80 × 9 = 378/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
24/90 = 24 × 8/90 × 8 = 192/720 - Add the two like fractions:
378/720 + 192/720 = 378 + 192/720 = 570/720 - 570/720 simplified gives 19/24
- So, 42/80 + 24/90 = 19/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+24/90 42/80+48/90 42/80+72/90