Add 72/70 and 56/63, Solve 1 2/70 + 56/63 as a fraction

Add 72/70 and 56/63

1^st number: 1 2/70, 2^nd number: 56/63

72/70 + 56/63 is 604/315.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
72/70 = 72 × 9/70 × 9 = 648/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
56/63 = 56 × 10/63 × 10 = 560/630
Add the two like fractions:
648/630 + 560/630 = 648 + 560/630 = 1208/630
1208/630 simplified gives 604/315
So, 72/70 + 56/63 = 604/315
In mixed form: 1289/315

MathStep (Works offline)

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