Add 21/2 and 15/45
1st number: 10 1/2, 2nd number: 15/45
21/2 + 15/45 is 65/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 2 × 45 = 90,
21/2 = 21 × 45/2 × 45 = 945/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
15/45 = 15 × 2/45 × 2 = 30/90 - Add the two like fractions:
945/90 + 30/90 = 945 + 30/90 = 975/90 - 975/90 simplified gives 65/6
- So, 21/2 + 15/45 = 65/6
In mixed form: 105/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+15/45 21/2+30/45 21/4+15/45 21/2+15/90 63/2+15/45 21/6+15/45 21/2+75/45 21/10+15/45 21/14+15/45