Add 84/90 and 72/63, Solve 84/90 + 1 9/63 as a fraction

Add 84/90 and 72/63

1^st number: 84/90, 2^nd number: 1 9/63

84/90 + 72/63 is 218/105.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
84/90 = 84 × 7/90 × 7 = 588/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
72/63 = 72 × 10/63 × 10 = 720/630
Add the two like fractions:
588/630 + 720/630 = 588 + 720/630 = 1308/630
1308/630 simplified gives 218/105
So, 84/90 + 72/63 = 218/105
In mixed form: 28/105

MathStep (Works offline)

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