Add 21/12 and 1/42
1st number: 1 9/12, 2nd number: 1/42
21/12 + 1/42 is 149/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
21/12 = 21 × 7/12 × 7 = 147/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
1/42 = 1 × 2/42 × 2 = 2/84 - Add the two like fractions:
147/84 + 2/84 = 147 + 2/84 = 149/84 - So, 21/12 + 1/42 = 149/84
In mixed form: 165/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+1/42 21/12+2/42 21/24+1/42 21/12+1/84 63/12+1/42 21/12+3/42 21/36+1/42 21/12+5/42 21/60+1/42 21/12+7/42 21/84+1/42