Add 72/90 and 18/54
72/90 + 18/54 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 90 × 3 = 270,
72/90 = 72 × 3/90 × 3 = 216/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
18/54 = 18 × 5/54 × 5 = 90/270 - Add the two like fractions:
216/270 + 90/270 = 216 + 90/270 = 306/270 - 306/270 simplified gives 17/15
- So, 72/90 + 18/54 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+36/54 72/90+90/54