Add 40/21 and 21/14
1st number: 1 19/21, 2nd number: 1 7/14
40/21 + 21/14 is 143/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
40/21 = 40 × 2/21 × 2 = 80/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
21/14 = 21 × 3/14 × 3 = 63/42 - Add the two like fractions:
80/42 + 63/42 = 80 + 63/42 = 143/42 - So, 40/21 + 21/14 = 143/42
In mixed form: 317/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+21/14 40/21+42/14 40/42+21/14 40/21+21/28 40/21+63/14 40/63+21/14 40/21+21/42 40/21+21/70 40/21+21/98