Add 20/80 and 3/90
20/80 + 3/90 is 17/60.
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,
20/80 = 20 × 9/80 × 9 = 180/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
3/90 = 3 × 8/90 × 8 = 24/720 - Add the two like fractions:
180/720 + 24/720 = 180 + 24/720 = 204/720 - 204/720 simplified gives 17/60
- So, 20/80 + 3/90 = 17/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+3/90 20/80+6/90 60/80+3/90 20/80+9/90 20/80+15/90 20/80+21/90