Add 90/45 and 21/30
1st number: 2 0/45, 2nd number: 21/30
90/45 + 21/30 is 27/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
90/45 = 90 × 2/45 × 2 = 180/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Add the two like fractions:
180/90 + 63/90 = 180 + 63/90 = 243/90 - 243/90 simplified gives 27/10
- So, 90/45 + 21/30 = 27/10
In mixed form: 27/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/45+42/30 90/45+21/60 90/45+63/30 90/45+21/90