Add 42/15 and 28/16
1st number: 2 12/15, 2nd number: 1 12/16
42/15 + 28/16 is 91/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 16 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
42/15 = 42 × 16/15 × 16 = 672/240 - Likewise, for the 2nd fraction, since 16 × 15 = 240,
28/16 = 28 × 15/16 × 15 = 420/240 - Add the two like fractions:
672/240 + 420/240 = 672 + 420/240 = 1092/240 - 1092/240 simplified gives 91/20
- So, 42/15 + 28/16 = 91/20
In mixed form: 411/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+28/16 42/15+56/16 42/30+28/16 42/15+28/32 42/15+84/16 42/45+28/16 42/15+28/48 42/75+28/16 42/15+28/80