Add 72/9 and 90/20
1st number: 8 0/9, 2nd number: 4 10/20
72/9 + 90/20 is 25/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
72/9 = 72 × 20/9 × 20 = 1440/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Add the two like fractions:
1440/180 + 810/180 = 1440 + 810/180 = 2250/180 - 2250/180 simplified gives 25/2
- So, 72/9 + 90/20 = 25/2
In mixed form: 121/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+90/20 72/9+90/40 72/27+90/20 72/9+90/60 72/45+90/20 72/63+90/20