Add 63/42 and 45/9, Solve 1 21/42 + 5 0/9 as a fraction

Add 63/42 and 45/9

1^st number: 1 21/42, 2^nd number: 5 0/9

63/42 + 45/9 is 13/2.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
63/42 = 63 × 3/42 × 3 = 189/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
45/9 = 45 × 14/9 × 14 = 630/126
Add the two like fractions:
189/126 + 630/126 = 189 + 630/126 = 819/126
819/126 simplified gives 13/2
So, 63/42 + 45/9 = 13/2
In mixed form: 61/2

MathStep (Works offline)

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