Add 15/21 and 1/4
15/21 + 1/4 is 27/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
1/4 = 1 × 21/4 × 21 = 21/84 - Add the two like fractions:
60/84 + 21/84 = 60 + 21/84 = 81/84 - 81/84 simplified gives 27/28
- So, 15/21 + 1/4 = 27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+1/4 15/21+2/4 15/42+1/4 15/21+1/8 45/21+1/4 15/21+3/4 15/63+1/4 15/21+1/12 75/21+1/4 15/21+5/4 15/21+1/20 15/21+7/4 15/21+1/28