Add 15/21 and 25/70
15/21 + 25/70 is 15/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
15/21 = 15 × 10/21 × 10 = 150/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
25/70 = 25 × 3/70 × 3 = 75/210 - Add the two like fractions:
150/210 + 75/210 = 150 + 75/210 = 225/210 - 225/210 simplified gives 15/14
- So, 15/21 + 25/70 = 15/14
In mixed form: 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+25/70 15/21+50/70 15/42+25/70 45/21+25/70 15/21+75/70 15/63+25/70 75/21+25/70