Add 21/14 and 9/42
1st number: 1 7/14, 2nd number: 9/42
21/14 + 9/42 is 12/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
21/14 = 21 × 3/14 × 3 = 63/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
9/42 = 9 × 1/42 × 1 = 9/42 - Add the two like fractions:
63/42 + 9/42 = 63 + 9/42 = 72/42 - 72/42 simplified gives 12/7
- So, 21/14 + 9/42 = 12/7
In mixed form: 15/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14+9/42 21/14+18/42 21/28+9/42 21/14+9/84 63/14+9/42 21/14+27/42 21/42+9/42 21/14+45/42 21/70+9/42 21/14+63/42 21/98+9/42