Add 7/15 and 30/21
1st number: 7/15, 2nd number: 1 9/21
7/15 + 30/21 is 199/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
7/15 = 7 × 7/15 × 7 = 49/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Add the two like fractions:
49/105 + 150/105 = 49 + 150/105 = 199/105 - So, 7/15 + 30/21 = 199/105
In mixed form: 194/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15+30/21 7/15+60/21 7/30+30/21 7/15+30/42 21/15+30/21 7/15+90/21 7/45+30/21 7/15+30/63 35/15+30/21 7/75+30/21 49/15+30/21