Add 18/4 and 42/72, Solve 4 2/4 + 42/72 as a fraction

Add 18/4 and 42/72

1^st number: 4 2/4, 2^nd number: 42/72

18/4 + 42/72 is 61/12.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 72 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 4 × 18 = 72,
18/4 = 18 × 18/4 × 18 = 324/72
Likewise, for the 2nd fraction, since 72 × 1 = 72,
42/72 = 42 × 1/72 × 1 = 42/72
Add the two like fractions:
324/72 + 42/72 = 324 + 42/72 = 366/72
366/72 simplified gives 61/12
So, 18/4 + 42/72 = 61/12
In mixed form: 51/12

MathStep (Works offline)

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