Add 42/15 and 72/28
1st number: 2 12/15, 2nd number: 2 16/28
42/15 + 72/28 is 188/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
42/15 = 42 × 28/15 × 28 = 1176/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
72/28 = 72 × 15/28 × 15 = 1080/420 - Add the two like fractions:
1176/420 + 1080/420 = 1176 + 1080/420 = 2256/420 - 2256/420 simplified gives 188/35
- So, 42/15 + 72/28 = 188/35
In mixed form: 513/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+72/28 42/30+72/28 42/15+72/56 42/45+72/28 42/15+72/84 42/75+72/28