Add 30/21 and 25/42
1st number: 1 9/21, 2nd number: 25/42
30/21 + 25/42 is 85/42.
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,
30/21 = 30 × 2/21 × 2 = 60/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
25/42 = 25 × 1/42 × 1 = 25/42 - Add the two like fractions:
60/42 + 25/42 = 60 + 25/42 = 85/42 - So, 30/21 + 25/42 = 85/42
In mixed form: 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+25/42 30/21+50/42 30/42+25/42 30/21+25/84 90/21+25/42 30/21+75/42 30/63+25/42