Add 90/72 and 18/20
1st number: 1 18/72, 2nd number: 18/20
90/72 + 18/20 is 43/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
18/20 = 18 × 18/20 × 18 = 324/360 - Add the two like fractions:
450/360 + 324/360 = 450 + 324/360 = 774/360 - 774/360 simplified gives 43/20
- So, 90/72 + 18/20 = 43/20
In mixed form: 23/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72+36/20 90/72+18/40 90/72+54/20 90/72+18/60 90/72+90/20