Add 30/21 and 20/25
1st number: 1 9/21, 2nd number: 20/25
30/21 + 20/25 is 78/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
30/21 = 30 × 25/21 × 25 = 750/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
20/25 = 20 × 21/25 × 21 = 420/525 - Add the two like fractions:
750/525 + 420/525 = 750 + 420/525 = 1170/525 - 1170/525 simplified gives 78/35
- So, 30/21 + 20/25 = 78/35
In mixed form: 28/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+20/25 30/21+40/25 30/42+20/25 30/21+20/50 90/21+20/25 30/21+60/25 30/63+20/25 30/21+20/75