Add 3/4 and 15/21
3/4 + 15/21 is 41/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Add the two like fractions:
63/84 + 60/84 = 63 + 60/84 = 123/84 - 123/84 simplified gives 41/28
- So, 3/4 + 15/21 = 41/28
In mixed form: 113/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4+15/21 3/4+30/21 3/8+15/21 3/4+15/42 9/4+15/21 3/4+45/21 3/12+15/21 3/4+15/63 15/4+15/21 3/4+75/21 3/20+15/21 21/4+15/21 3/28+15/21