Subtraction of fractions with different denominators

Example:
Subtract fractions examples
Solution:
The denominator of the first fraction is 6, and 6 = 2 × 3
The denominator of the second fraction is 10, and 10 = 2 × 5
Thus, the least common denominator (LCD) is 2 × 3 × 5 = 30
Subtract fractions examples
Note:
The denominators of the fractions can not be zero.
Formula to subtract two fractions:
a/b - c/d = (ad - cb)/bd, in which the denominators b and d can not be zero