Add 15/14 and 81/21
1st number: 1 1/14, 2nd number: 3 18/21
15/14 + 81/21 is 69/14.
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,
81/21 = 81 × 2/21 × 2 = 162/42 - Add the two like fractions:
45/42 + 162/42 = 45 + 162/42 = 207/42 - 207/42 simplified gives 69/14
- So, 15/14 + 81/21 = 69/14
In mixed form: 413/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/14+81/21 15/28+81/21 15/14+81/42 45/14+81/21 15/42+81/21 15/14+81/63 75/14+81/21 15/70+81/21 15/98+81/21