Add 20/80 and 72/45, Solve 20/80 + 1 27/45 as a fraction

Add 20/80 and 72/45

1^st number: 20/80, 2^nd number: 1 27/45

20/80 + 72/45 is 37/20.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720
Likewise, for the 2nd fraction, since 45 × 16 = 720,
72/45 = 72 × 16/45 × 16 = 1152/720
Add the two like fractions:
180/720 + 1152/720 = 180 + 1152/720 = 1332/720
1332/720 simplified gives 37/20
So, 20/80 + 72/45 = 37/20
In mixed form: 117/20

MathStep (Works offline)

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