Add 21/84 and 30/50
21/84 + 30/50 is 17/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 50 is 2100
Next, find the equivalent fraction of both fractional numbers with denominator 2100 - For the 1st fraction, since 84 × 25 = 2100,
21/84 = 21 × 25/84 × 25 = 525/2100 - Likewise, for the 2nd fraction, since 50 × 42 = 2100,
30/50 = 30 × 42/50 × 42 = 1260/2100 - Add the two like fractions:
525/2100 + 1260/2100 = 525 + 1260/2100 = 1785/2100 - 1785/2100 simplified gives 17/20
- So, 21/84 + 30/50 = 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+30/50 21/84+60/50 63/84+30/50 21/84+90/50