Add 90/42 and 28/15
1st number: 2 6/42, 2nd number: 1 13/15
90/42 + 28/15 is 421/105.
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,
90/42 = 90 × 5/42 × 5 = 450/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
28/15 = 28 × 14/15 × 14 = 392/210 - Add the two like fractions:
450/210 + 392/210 = 450 + 392/210 = 842/210 - 842/210 simplified gives 421/105
- So, 90/42 + 28/15 = 421/105
In mixed form: 41/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+56/15 90/84+28/15 90/42+28/30 90/42+84/15 90/42+28/45 90/42+28/75