Add 30/28 and 9/72, Solve 1 2/28 + 9/72 as a fraction

Add 30/28 and 9/72

1^st number: 1 2/28, 2^nd number: 9/72

30/28 + 9/72 is 67/56.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 72 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 28 × 18 = 504,
30/28 = 30 × 18/28 × 18 = 540/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
9/72 = 9 × 7/72 × 7 = 63/504
Add the two like fractions:
540/504 + 63/504 = 540 + 63/504 = 603/504
603/504 simplified gives 67/56
So, 30/28 + 9/72 = 67/56
In mixed form: 111/56

MathStep (Works offline)

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