Add 42/28 and 9/12, Solve 1 14/28 + 9/12 as a fraction

Add 42/28 and 9/12

1^st number: 1 14/28, 2^nd number: 9/12

42/28 + 9/12 is 9/4.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 28 × 3 = 84,
42/28 = 42 × 3/28 × 3 = 126/84
Likewise, for the 2nd fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84
Add the two like fractions:
126/84 + 63/84 = 126 + 63/84 = 189/84
189/84 simplified gives 9/4
So, 42/28 + 9/12 = 9/4
In mixed form: 21/4

MathStep (Works offline)

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