Add 3/4 and 21/30
3/4 + 21/30 is 29/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
3/4 = 3 × 15/4 × 15 = 45/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
21/30 = 21 × 2/30 × 2 = 42/60 - Add the two like fractions:
45/60 + 42/60 = 45 + 42/60 = 87/60 - 87/60 simplified gives 29/20
- So, 3/4 + 21/30 = 29/20
In mixed form: 19/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/4+21/30 3/4+42/30 3/8+21/30 3/4+21/60 9/4+21/30 3/4+63/30 3/12+21/30 3/4+21/90 15/4+21/30 3/20+21/30 21/4+21/30 3/28+21/30