Add 7/21 and 30/15
1st number: 7/21, 2nd number: 2 0/15
7/21 + 30/15 is 7/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
7/21 = 7 × 5/21 × 5 = 35/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
30/15 = 30 × 7/15 × 7 = 210/105 - Add the two like fractions:
35/105 + 210/105 = 35 + 210/105 = 245/105 - 245/105 simplified gives 7/3
- So, 7/21 + 30/15 = 7/3
In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+30/15 7/21+60/15 7/42+30/15 7/21+90/15 7/63+30/15 7/21+30/45 35/21+30/15 7/21+30/75 49/21+30/15