How To Solve Percentage Math Problems

Look at the pairs of multiplication and division facts below, and look for a pattern in each row.

Percent problems can also be solved by writing a proportion.

The correct percent fraction for the proportion is Jeff has a coupon at the Guitar Store for 15% off any purchase of $100 or more.

Jeff wonders how much money the coupon will take off of the $220 original price Percent problems have three parts: the percent, the base (or whole), and the amount.

As we discussed in pre-algebra, percent is a ratio that compares a number to 100. Percent is usually expressed with the percent symbol %.

Percent problems are usually solved by using proportions.

However, in this case, the question requires that you calculate another answer first: the number of questions Abel got right.

You'll need to subtract 4 from 80, then calculate the percentage of the difference: The standard approach would be to multiply 200 by 0.92: 200*.92=184.

You probably put the amount (18) over 100 in the proportion, rather than the percent (125).

Perhaps you thought 18 was the percent and 125 was the base.


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