Add 25/15 and 12/21
1st number: 1 10/15, 2nd number: 12/21
25/15 + 12/21 is 47/21.
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,
25/15 = 25 × 7/15 × 7 = 175/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Add the two like fractions:
175/105 + 60/105 = 175 + 60/105 = 235/105 - 235/105 simplified gives 47/21
- So, 25/15 + 12/21 = 47/21
In mixed form: 25/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/15+12/21 25/15+24/21 25/30+12/21 25/15+12/42 75/15+12/21 25/15+36/21 25/45+12/21 25/15+12/63 25/15+60/21 25/75+12/21 25/15+84/21