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Home > CC1 > Chapter 3 > Lesson 3.1.2 > Problem 3-33


Maribel is taking advantage of the sale at Cassie’s Cashew Shoppe. She wants to figure out how much she will save on a purchase of . Maribel’s percent ruler is shown below. Copy the ruler on your paper and help her figure out what of is.

A percent ruler is scaled by 20% and labeled 0%, 20%, 40%, 60%, 80%, and 100%. Below the 0% is $0. Below the 100% is $34.

To start, it would be helpful to scale the lower portion of the number line. Do you remember how to do this?

Now that you know is equal to , can you scale the rest of the number line to find the value of ?

First, we can find out how much money will be just one tick mark on the number line. Start by counting the number of tick marks (). We know that will be distributed among these tick marks.

With the information gathered in Step 1, we can now find what amount will be labeled on the first tick mark (). We will find this value by dividing the total () by the number of tick marks (10).

Each tick mark represents .