Add 15/25 and 9/28
15/25 + 9/28 is 129/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 28 is 700
Next, find the equivalent fraction of both fractional numbers with denominator 700 - For the 1st fraction, since 25 × 28 = 700,
15/25 = 15 × 28/25 × 28 = 420/700 - Likewise, for the 2nd fraction, since 28 × 25 = 700,
9/28 = 9 × 25/28 × 25 = 225/700 - Add the two like fractions:
420/700 + 225/700 = 420 + 225/700 = 645/700 - 645/700 simplified gives 129/140
- So, 15/25 + 9/28 = 129/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/25+9/28 15/25+18/28 15/50+9/28 15/25+9/56 45/25+9/28 15/25+27/28 15/75+9/28 15/25+9/84 75/25+9/28 15/25+45/28 15/25+63/28