Add 28/80 and 18/15
1st number: 28/80, 2nd number: 1 3/15
28/80 + 18/15 is 31/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 15 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
28/80 = 28 × 3/80 × 3 = 84/240 - Likewise, for the 2nd fraction, since 15 × 16 = 240,
18/15 = 18 × 16/15 × 16 = 288/240 - Add the two like fractions:
84/240 + 288/240 = 84 + 288/240 = 372/240 - 372/240 simplified gives 31/20
- So, 28/80 + 18/15 = 31/20
In mixed form: 111/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80+18/15 28/80+36/15 28/80+18/30 84/80+18/15 28/80+54/15 28/80+18/45 28/80+90/15 28/80+18/75