Add 42/21 and 45/6, Solve 2 0/21 + 7 3/6 as a fraction

Add 42/21 and 45/6

1^st number: 2 0/21, 2^nd number: 7 3/6

42/21 + 45/6 is 19/2.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 21 × 2 = 42,
42/21 = 42 × 2/21 × 2 = 84/42
Likewise, for the 2nd fraction, since 6 × 7 = 42,
45/6 = 45 × 7/6 × 7 = 315/42
Add the two like fractions:
84/42 + 315/42 = 84 + 315/42 = 399/42
399/42 simplified gives 19/2
So, 42/21 + 45/6 = 19/2
In mixed form: 91/2

MathStep (Works offline)

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