Add 28/15 and 90/42
1st number: 1 13/15, 2nd number: 2 6/42
28/15 + 90/42 is 421/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
28/15 = 28 × 14/15 × 14 = 392/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
90/42 = 90 × 5/42 × 5 = 450/210 - Add the two like fractions:
392/210 + 450/210 = 392 + 450/210 = 842/210 - 842/210 simplified gives 421/105
- So, 28/15 + 90/42 = 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: 56/15+90/42 28/30+90/42 28/15+90/84 84/15+90/42 28/45+90/42 28/75+90/42