Add 4/21 and 3/4
4/21 + 3/4 is 79/84.
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,
4/21 = 4 × 4/21 × 4 = 16/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Add the two like fractions:
16/84 + 63/84 = 16 + 63/84 = 79/84 - So, 4/21 + 3/4 = 79/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+3/4 4/21+6/4 4/42+3/4 4/21+3/8 12/21+3/4 4/21+9/4 4/63+3/4 4/21+3/12 20/21+3/4 4/21+15/4 4/21+3/20 28/21+3/4 4/21+21/4 4/21+3/28