Add 42/12 and 4/72, Solve 3 6/12 + 4/72 as a fraction

Add 42/12 and 4/72

1^st number: 3 6/12, 2^nd number: 4/72

42/12 + 4/72 is 32/9.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 72 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 12 × 6 = 72,
42/12 = 42 × 6/12 × 6 = 252/72
Likewise, for the 2nd fraction, since 72 × 1 = 72,
4/72 = 4 × 1/72 × 1 = 4/72
Add the two like fractions:
252/72 + 4/72 = 252 + 4/72 = 256/72
256/72 simplified gives 32/9
So, 42/12 + 4/72 = 32/9
In mixed form: 35/9

MathStep (Works offline)

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