The expression is .

To subtract  means add .

To add fractions the denominators must be equal.

Find the least common denominator (LCD).

Multiples of 10: 10,20,30,40,.............

Multiples of 5: 5,10,15,20,25,............

The least common multiple of 5 and 10 is 10.

Rewrite each fraction with a common denominator of 10.

Rewrite the equivalent fractions using the LCD.

=

Denominators are same, write sum of numerators over denominator.

                         (Lcm is 10)

                               (Add: )

The difference is .