Subtract 20/84 from 75/6, Solve 12 3/6

Subtract 20/84 from 75/6

1^st number: 12 3/6, 2^nd number: 20/84

75/6 - 20/84 is 515/42.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 84 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 6 × 14 = 84,
75/6 = 75 × 14/6 × 14 = 1050/84
Likewise, for the 2nd fraction, since 84 × 1 = 84,
20/84 = 20 × 1/84 × 1 = 20/84
Subtract the two like fractions:
1050/84 - 20/84 = 1050 - 20/84 = 1030/84
After reducing the fraction, the answer is 515/42
In mixed form: 1211/42

MathStep (Works offline)

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