Add 21/4 and 25/18
1st number: 5 1/4, 2nd number: 1 7/18
21/4 + 25/18 is 239/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
21/4 = 21 × 9/4 × 9 = 189/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
25/18 = 25 × 2/18 × 2 = 50/36 - Add the two like fractions:
189/36 + 50/36 = 189 + 50/36 = 239/36 - So, 21/4 + 25/18 = 239/36
In mixed form: 623/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+25/18 21/4+50/18 21/8+25/18 21/4+25/36 63/4+25/18 21/4+75/18 21/12+25/18 21/4+25/54 21/20+25/18 21/4+25/90 21/28+25/18