Add 56/45 and 2/21, Solve 1 11/45 + 2/21 as a fraction

Add 56/45 and 2/21

1^st number: 1 11/45, 2^nd number: 2/21

56/45 + 2/21 is 422/315.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 45 × 7 = 315,
56/45 = 56 × 7/45 × 7 = 392/315
Likewise, for the 2nd fraction, since 21 × 15 = 315,
2/21 = 2 × 15/21 × 15 = 30/315
Add the two like fractions:
392/315 + 30/315 = 392 + 30/315 = 422/315
So, 56/45 + 2/21 = 422/315
In mixed form: 1107/315

MathStep (Works offline)

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