Add 18/42 and 24/20, Solve 18/42 + 1 4/20 as a fraction

Add 18/42 and 24/20

1^st number: 18/42, 2^nd number: 1 4/20

18/42 + 24/20 is 57/35.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 42 × 10 = 420,
18/42 = 18 × 10/42 × 10 = 180/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
24/20 = 24 × 21/20 × 21 = 504/420
Add the two like fractions:
180/420 + 504/420 = 180 + 504/420 = 684/420
684/420 simplified gives 57/35
So, 18/42 + 24/20 = 57/35
In mixed form: 122/35

MathStep (Works offline)

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