Add 15/14 and 30/21
1st number: 1 1/14, 2nd number: 1 9/21
15/14 + 30/21 is 5/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
15/14 = 15 × 3/14 × 3 = 45/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
30/21 = 30 × 2/21 × 2 = 60/42 - Add the two like fractions:
45/42 + 60/42 = 45 + 60/42 = 105/42 - 105/42 simplified gives 5/2
- So, 15/14 + 30/21 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/14+30/21 15/14+60/21 15/28+30/21 15/14+30/42 45/14+30/21 15/14+90/21 15/42+30/21 15/14+30/63 75/14+30/21 15/70+30/21 15/98+30/21