Add 4/21 and 80/60, Solve 4/21 + 1 20/60 as a fraction

Add 4/21 and 80/60

1^st number: 4/21, 2^nd number: 1 20/60

4/21 + 80/60 is 32/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 21 × 20 = 420,
4/21 = 4 × 20/21 × 20 = 80/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
80/60 = 80 × 7/60 × 7 = 560/420
Add the two like fractions:
80/420 + 560/420 = 80 + 560/420 = 640/420
640/420 simplified gives 32/21
So, 4/21 + 80/60 = 32/21
In mixed form: 111/21

MathStep (Works offline)

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