Add 28/12 and 28/40, Solve 2 4/12 + 28/40 as a fraction

Add 28/12 and 28/40

1^st number: 2 4/12, 2^nd number: 28/40

28/12 + 28/40 is 91/30.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 12 × 10 = 120,
28/12 = 28 × 10/12 × 10 = 280/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
28/40 = 28 × 3/40 × 3 = 84/120
Add the two like fractions:
280/120 + 84/120 = 280 + 84/120 = 364/120
364/120 simplified gives 91/30
So, 28/12 + 28/40 = 91/30
In mixed form: 31/30

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad