Add 54/63 and 90/54, Solve 54/63 + 1 36/54 as a fraction

Add 54/63 and 90/54

1^st number: 54/63, 2^nd number: 1 36/54

54/63 + 90/54 is 53/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 63 × 6 = 378,
54/63 = 54 × 6/63 × 6 = 324/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378
Add the two like fractions:
324/378 + 630/378 = 324 + 630/378 = 954/378
954/378 simplified gives 53/21
So, 54/63 + 90/54 = 53/21
In mixed form: 211/21

MathStep (Works offline)

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