Add 21/25 and 30/21
1st number: 21/25, 2nd number: 1 9/21
21/25 + 30/21 is 397/175.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 25 × 21 = 525,
21/25 = 21 × 21/25 × 21 = 441/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
30/21 = 30 × 25/21 × 25 = 750/525 - Add the two like fractions:
441/525 + 750/525 = 441 + 750/525 = 1191/525 - 1191/525 simplified gives 397/175
- So, 21/25 + 30/21 = 397/175
In mixed form: 247/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+30/21 21/25+60/21 21/50+30/21 21/25+30/42 63/25+30/21 21/25+90/21 21/75+30/21 21/25+30/63