Add 12/21 and 16/42
12/21 + 16/42 is 20/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
12/21 = 12 × 2/21 × 2 = 24/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
16/42 = 16 × 1/42 × 1 = 16/42 - Add the two like fractions:
24/42 + 16/42 = 24 + 16/42 = 40/42 - 40/42 simplified gives 20/21
- So, 12/21 + 16/42 = 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+16/42 12/21+32/42 12/42+16/42 12/21+16/84 36/21+16/42 12/21+48/42 12/63+16/42 60/21+16/42 12/21+80/42 84/21+16/42