Add 84/21 and 27/84, Solve 4 0/21 + 27/84 as a fraction

Add 84/21 and 27/84

1^st number: 4 0/21, 2^nd number: 27/84

84/21 + 27/84 is 121/28.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 21 × 4 = 84,
84/21 = 84 × 4/21 × 4 = 336/84
Likewise, for the 2nd fraction, since 84 × 1 = 84,
27/84 = 27 × 1/84 × 1 = 27/84
Add the two like fractions:
336/84 + 27/84 = 336 + 27/84 = 363/84
363/84 simplified gives 121/28
So, 84/21 + 27/84 = 121/28
In mixed form: 49/28

MathStep (Works offline)

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