Add 18/72 and 75/90
18/72 + 75/90 is 13/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
18/72 = 18 × 5/72 × 5 = 90/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
75/90 = 75 × 4/90 × 4 = 300/360 - Add the two like fractions:
90/360 + 300/360 = 90 + 300/360 = 390/360 - 390/360 simplified gives 13/12
- So, 18/72 + 75/90 = 13/12
In mixed form: 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72+75/90 54/72+75/90 90/72+75/90