Add 21/2 and 45/18
1st number: 10 1/2, 2nd number: 2 9/18
21/2 + 45/18 is 13/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 2 × 9 = 18,
21/2 = 21 × 9/2 × 9 = 189/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
45/18 = 45 × 1/18 × 1 = 45/18 - Add the two like fractions:
189/18 + 45/18 = 189 + 45/18 = 234/18 - 234/18 simplified gives 13/1
- So, 21/2 + 45/18 = 13/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+45/18 21/2+90/18 21/4+45/18 21/2+45/36 63/2+45/18 21/6+45/18 21/2+45/54 21/10+45/18 21/2+45/90 21/14+45/18