Add 21/18 and 1/4
1st number: 1 3/18, 2nd number: 1/4
21/18 + 1/4 is 17/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 4 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Likewise, for the 2nd fraction, since 4 × 9 = 36,
1/4 = 1 × 9/4 × 9 = 9/36 - Add the two like fractions:
42/36 + 9/36 = 42 + 9/36 = 51/36 - 51/36 simplified gives 17/12
- So, 21/18 + 1/4 = 17/12
In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+1/4 21/18+2/4 21/36+1/4 21/18+1/8 63/18+1/4 21/18+3/4 21/54+1/4 21/18+1/12 21/18+5/4 21/90+1/4 21/18+1/20 21/18+7/4 21/18+1/28