Add 60/45 and 21/42, Solve 1 15/45 + 21/42 as a fraction

Add 60/45 and 21/42

1^st number: 1 15/45, 2^nd number: 21/42

60/45 + 21/42 is 11/6.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 45 × 14 = 630,
60/45 = 60 × 14/45 × 14 = 840/630
Likewise, for the 2nd fraction, since 42 × 15 = 630,
21/42 = 21 × 15/42 × 15 = 315/630
Add the two like fractions:
840/630 + 315/630 = 840 + 315/630 = 1155/630
1155/630 simplified gives 11/6
So, 60/45 + 21/42 = 11/6
In mixed form: 15/6

MathStep (Works offline)

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