Add 4/12 and 16/21
4/12 + 16/21 is 23/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
4/12 = 4 × 7/12 × 7 = 28/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
16/21 = 16 × 4/21 × 4 = 64/84 - Add the two like fractions:
28/84 + 64/84 = 28 + 64/84 = 92/84 - 92/84 simplified gives 23/21
- So, 4/12 + 16/21 = 23/21
In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+16/21 4/12+32/21 4/24+16/21 4/12+16/42 4/12+48/21 4/36+16/21 4/12+16/63 20/12+16/21 4/12+80/21 4/60+16/21 28/12+16/21 4/84+16/21