Add 72/54 and 21/90
1st number: 1 18/54, 2nd number: 21/90
72/54 + 21/90 is 47/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
72/54 = 72 × 5/54 × 5 = 360/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
21/90 = 21 × 3/90 × 3 = 63/270 - Add the two like fractions:
360/270 + 63/270 = 360 + 63/270 = 423/270 - 423/270 simplified gives 47/30
- So, 72/54 + 21/90 = 47/30
In mixed form: 117/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/54+42/90 72/54+63/90