Add 15/30 and 7/28
15/30 + 7/28 is 3/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
15/30 = 15 × 14/30 × 14 = 210/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
7/28 = 7 × 15/28 × 15 = 105/420 - Add the two like fractions:
210/420 + 105/420 = 210 + 105/420 = 315/420 - 315/420 simplified gives 3/4
- So, 15/30 + 7/28 = 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30+14/28 15/60+7/28 15/30+7/56 45/30+7/28 15/30+21/28 15/90+7/28 15/30+7/84 75/30+7/28 15/30+35/28 15/30+49/28