Add 21/2 and 72/18
1st number: 10 1/2, 2nd number: 4 0/18
21/2 + 72/18 is 29/2.
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,
72/18 = 72 × 1/18 × 1 = 72/18 - Add the two like fractions:
189/18 + 72/18 = 189 + 72/18 = 261/18 - 261/18 simplified gives 29/2
- So, 21/2 + 72/18 = 29/2
In mixed form: 141/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+72/18 21/4+72/18 21/2+72/36 63/2+72/18 21/6+72/18 21/2+72/54 21/10+72/18 21/2+72/90 21/14+72/18