Add 3/28 and 84/72, Solve 3/28 + 1 12/72 as a fraction

Add 3/28 and 84/72

1^st number: 3/28, 2^nd number: 1 12/72

3/28 + 84/72 is 107/84.

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,
3/28 = 3 × 18/28 × 18 = 54/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
84/72 = 84 × 7/72 × 7 = 588/504
Add the two like fractions:
54/504 + 588/504 = 54 + 588/504 = 642/504
642/504 simplified gives 107/84
So, 3/28 + 84/72 = 107/84
In mixed form: 123/84

MathStep (Works offline)

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