Add 90/20 and 90/18
1st number: 4 10/20, 2nd number: 5 0/18
90/20 + 90/18 is 19/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
90/18 = 90 × 10/18 × 10 = 900/180 - Add the two like fractions:
810/180 + 900/180 = 810 + 900/180 = 1710/180 - 1710/180 simplified gives 19/2
- So, 90/20 + 90/18 = 19/2
In mixed form: 91/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+90/18 90/20+90/36 90/60+90/18 90/20+90/54