Add 20/98 and 40/80, Solve 20/98 + 40/80 as a fraction

Add 20/98 and 40/80

20/98 + 40/80 is 69/98.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 80 is 3920

Next, find the equivalent fraction of both fractional numbers with denominator 3920
For the 1st fraction, since 98 × 40 = 3920,
20/98 = 20 × 40/98 × 40 = 800/3920
Likewise, for the 2nd fraction, since 80 × 49 = 3920,
40/80 = 40 × 49/80 × 49 = 1960/3920
Add the two like fractions:
800/3920 + 1960/3920 = 800 + 1960/3920 = 2760/3920
2760/3920 simplified gives 69/98
So, 20/98 + 40/80 = 69/98

MathStep (Works offline)

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