Add 21/28 and 30/50
21/28 + 30/50 is 27/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 50 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 28 × 25 = 700,
21/28 = 21 × 25/28 × 25 = 525/700 - Likewise, for the 2nd fraction, since 50 × 14 = 700,
30/50 = 30 × 14/50 × 14 = 420/700 - Add the two like fractions:
525/700 + 420/700 = 525 + 420/700 = 945/700 - 945/700 simplified gives 27/20
- So, 21/28 + 30/50 = 27/20
In mixed form: 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+30/50 21/28+60/50 21/56+30/50 63/28+30/50 21/28+90/50 21/84+30/50