Add 25/8 and 21/18
1st number: 3 1/8, 2nd number: 1 3/18
25/8 + 21/18 is 103/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
25/8 = 25 × 9/8 × 9 = 225/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
21/18 = 21 × 4/18 × 4 = 84/72 - Add the two like fractions:
225/72 + 84/72 = 225 + 84/72 = 309/72 - 309/72 simplified gives 103/24
- So, 25/8 + 21/18 = 103/24
In mixed form: 47/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/8+21/18 25/8+42/18 25/16+21/18 25/8+21/36 75/8+21/18 25/8+63/18 25/24+21/18 25/8+21/54 25/40+21/18 25/8+21/90 25/56+21/18