Add 84/21 and 6/30, Solve 4 0/21 + 6/30 as a fraction

Add 84/21 and 6/30

1^st number: 4 0/21, 2^nd number: 6/30

84/21 + 6/30 is 21/5.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
84/21 = 84 × 10/21 × 10 = 840/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
6/30 = 6 × 7/30 × 7 = 42/210
Add the two like fractions:
840/210 + 42/210 = 840 + 42/210 = 882/210
882/210 simplified gives 21/5
So, 84/21 + 6/30 = 21/5
In mixed form: 41/5

MathStep (Works offline)

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