The cost of a skateboard is $60. it went on sale and is now 33% off. what is the amount of the skateboard now?

To find the answer for this question, you need to convert your percent to a fraction. (33/100) You will multiply 60 by 33/100, and get 19.8. That shows you the discount you are getting. Finally, you need to subtract 19.8 from 60, getting you a final answer of $40.2.

$19.8                        change into decimal and times by the original 

In order to determine whether two expressions are equivalent to one another, they are equated using an equals to sign (=) and then simplified. Upon simplification, the expressions should yield a logical and true statement. For example, a simplified expression may present
2 = 2
If such a case is present, then we know that the expressions are indeed equal. However, if the two sides are not equal, lets say
2 = 3
Then the expressions are not equal.

By verifying expressions, we are usually able to cross check our solutions to problems and also determine whether the answer(s) obtained makes sense.