Add 14/42 and 81/21, Solve 14/42 + 3 18/21 as a fraction

Add 14/42 and 81/21

1^st number: 14/42, 2^nd number: 3 18/21

14/42 + 81/21 is 88/21.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 42 × 1 = 42,
14/42 = 14 × 1/42 × 1 = 14/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
81/21 = 81 × 2/21 × 2 = 162/42
Add the two like fractions:
14/42 + 162/42 = 14 + 162/42 = 176/42
176/42 simplified gives 88/21
So, 14/42 + 81/21 = 88/21
In mixed form: 44/21

MathStep (Works offline)

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