Add 30/21 and 25/28
1st number: 1 9/21, 2nd number: 25/28
30/21 + 25/28 is 65/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
30/21 = 30 × 4/21 × 4 = 120/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
25/28 = 25 × 3/28 × 3 = 75/84 - Add the two like fractions:
120/84 + 75/84 = 120 + 75/84 = 195/84 - 195/84 simplified gives 65/28
- So, 30/21 + 25/28 = 65/28
In mixed form: 29/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+25/28 30/21+50/28 30/42+25/28 30/21+25/56 90/21+25/28 30/21+75/28 30/63+25/28 30/21+25/84