Add 1/42 and 15/21
1/42 + 15/21 is 31/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
1/42 = 1 × 1/42 × 1 = 1/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Add the two like fractions:
1/42 + 30/42 = 1 + 30/42 = 31/42 - So, 1/42 + 15/21 = 31/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42+15/21 1/42+30/21 1/84+15/21 1/42+15/42 3/42+15/21 1/42+45/21 1/42+15/63 5/42+15/21 1/42+75/21 7/42+15/21