Add 20/50 and 21/45
20/50 + 21/45 is 13/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 45 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 50 × 9 = 450,
20/50 = 20 × 9/50 × 9 = 180/450 - Likewise, for the 2nd fraction, since 45 × 10 = 450,
21/45 = 21 × 10/45 × 10 = 210/450 - Add the two like fractions:
180/450 + 210/450 = 180 + 210/450 = 390/450 - 390/450 simplified gives 13/15
- So, 20/50 + 21/45 = 13/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/50+21/45 20/50+42/45 20/50+21/90 60/50+21/45 20/50+63/45