Add 21/45 and 30/50
21/45 + 30/50 is 16/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 45 × 10 = 450,
21/45 = 21 × 10/45 × 10 = 210/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
30/50 = 30 × 9/50 × 9 = 270/450 - Add the two like fractions:
210/450 + 270/450 = 210 + 270/450 = 480/450 - 480/450 simplified gives 16/15
- So, 21/45 + 30/50 = 16/15
In mixed form: 11/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+30/50 21/45+60/50 21/90+30/50 63/45+30/50 21/45+90/50