Add 84/42 and 36/80, Solve 2 0/42 + 36/80 as a fraction

Add 84/42 and 36/80

1^st number: 2 0/42, 2^nd number: 36/80

84/42 + 36/80 is 49/20.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 42 × 40 = 1680,
84/42 = 84 × 40/42 × 40 = 3360/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
36/80 = 36 × 21/80 × 21 = 756/1680
Add the two like fractions:
3360/1680 + 756/1680 = 3360 + 756/1680 = 4116/1680
4116/1680 simplified gives 49/20
So, 84/42 + 36/80 = 49/20
In mixed form: 29/20

MathStep (Works offline)

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