Add 84/42 and 8/20, Solve 2 0/42 + 8/20 as a fraction

Add 84/42 and 8/20

1^st number: 2 0/42, 2^nd number: 8/20

84/42 + 8/20 is 12/5.

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,
84/42 = 84 × 10/42 × 10 = 840/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
8/20 = 8 × 21/20 × 21 = 168/420
Add the two like fractions:
840/420 + 168/420 = 840 + 168/420 = 1008/420
1008/420 simplified gives 12/5
So, 84/42 + 8/20 = 12/5
In mixed form: 22/5

MathStep (Works offline)

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