Add 30/15 and 42/28
1st number: 2 0/15, 2nd number: 1 14/28
30/15 + 42/28 is 7/2.
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,
30/15 = 30 × 28/15 × 28 = 840/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
42/28 = 42 × 15/28 × 15 = 630/420 - Add the two like fractions:
840/420 + 630/420 = 840 + 630/420 = 1470/420 - 1470/420 simplified gives 7/2
- So, 30/15 + 42/28 = 7/2
In mixed form: 31/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+42/28 30/15+84/28 30/15+42/56 90/15+42/28 30/45+42/28 30/15+42/84 30/75+42/28