Add 28/42 and 25/15
1st number: 28/42, 2nd number: 1 10/15
28/42 + 25/15 is 7/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
28/42 = 28 × 5/42 × 5 = 140/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
25/15 = 25 × 14/15 × 14 = 350/210 - Add the two like fractions:
140/210 + 350/210 = 140 + 350/210 = 490/210 - 490/210 simplified gives 7/3
- So, 28/42 + 25/15 = 7/3
In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+25/15 28/42+50/15 28/84+25/15 28/42+25/30 84/42+25/15 28/42+75/15 28/42+25/45 28/42+25/75