Add 7/21 and 15/25
7/21 + 15/25 is 14/15.
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,
7/21 = 7 × 25/21 × 25 = 175/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
15/25 = 15 × 21/25 × 21 = 315/525 - Add the two like fractions:
175/525 + 315/525 = 175 + 315/525 = 490/525 - 490/525 simplified gives 14/15
- So, 7/21 + 15/25 = 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+15/25 7/21+30/25 7/42+15/25 7/21+15/50 7/21+45/25 7/63+15/25 7/21+15/75 35/21+15/25 7/21+75/25 49/21+15/25