Add 15/25 and 54/21
1st number: 15/25, 2nd number: 2 12/21
15/25 + 54/21 is 111/35.
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,
54/21 = 54 × 25/21 × 25 = 1350/525 - Add the two like fractions:
315/525 + 1350/525 = 315 + 1350/525 = 1665/525 - 1665/525 simplified gives 111/35
- So, 15/25 + 54/21 = 111/35
In mixed form: 36/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/25+54/21 15/50+54/21 15/25+54/42 45/25+54/21 15/75+54/21 15/25+54/63 75/25+54/21