** CALCULATING ORIGINAL PRICE LESSON PLAN**

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Teaching Materials

Lesson Excerpt:

If you know the amount of a discount and the % of the discount, how can you calculate the original price? Let’s look at this question in a little more detail.

First, you know what you paid for the item. Let’s say **you paid $18.00**.

Then, you also know **the discount was 40%.**

**How can we use these two numbers to calculate the original price of the item?**

If we have the sales price and the % of the discount, we have all that we need to do this calculation.

**The first thing that we are going to need to do is to write an equation.**

Here is how we can reword this problem:

18 is 40% of what number?

This is saying that after we took a discount of 40% from some number and ended up with 18.

**Let’s write the equation.**

“18 is” becomes 18 =

40% becomes a decimal .40

“of” means to multiply

What number is our unknown x?

Here is the equation.

18 = .40x

Next, we need to get x alone, so we divide both sides of the equation by .40.

Continued...

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