Add 75/84 and 81/56, Solve 75/84 + 1 25/56 as a fraction

Add 75/84 and 81/56

1^st number: 75/84, 2^nd number: 1 25/56

75/84 + 81/56 is 131/56.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 56 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 84 × 2 = 168,
75/84 = 75 × 2/84 × 2 = 150/168
Likewise, for the 2nd fraction, since 56 × 3 = 168,
81/56 = 81 × 3/56 × 3 = 243/168
Add the two like fractions:
150/168 + 243/168 = 150 + 243/168 = 393/168
393/168 simplified gives 131/56
So, 75/84 + 81/56 = 131/56
In mixed form: 219/56

MathStep (Works offline)

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