Add 15/25 and 36/21
1st number: 15/25, 2nd number: 1 15/21
15/25 + 36/21 is 81/35.
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,
15/25 = 15 × 21/25 × 21 = 315/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
36/21 = 36 × 25/21 × 25 = 900/525 - Add the two like fractions:
315/525 + 900/525 = 315 + 900/525 = 1215/525 - 1215/525 simplified gives 81/35
- So, 15/25 + 36/21 = 81/35
In mixed form: 211/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/25+36/21 15/25+72/21 15/50+36/21 15/25+36/42 45/25+36/21 15/75+36/21 15/25+36/63 75/25+36/21