Add 15/2 and 7/21
1st number: 7 1/2, 2nd number: 7/21
15/2 + 7/21 is 47/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
15/2 = 15 × 21/2 × 21 = 315/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
7/21 = 7 × 2/21 × 2 = 14/42 - Add the two like fractions:
315/42 + 14/42 = 315 + 14/42 = 329/42 - 329/42 simplified gives 47/6
- So, 15/2 + 7/21 = 47/6
In mixed form: 75/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/2+7/21 15/2+14/21 15/4+7/21 15/2+7/42 45/2+7/21 15/6+7/21 15/2+7/63 75/2+7/21 15/2+35/21 15/10+7/21 15/2+49/21 15/14+7/21