**Activity #1**

In the following warmup exercise, you are going to solve each problem on the card mentally before you click on to see the answer. After that, click to move forward. You can use to navigate backward.

**Activity #2**

** Calculate a Percentage Value**.

- With the help of the diagram below, explain how you can calculate each value mentally:

(1.) 9 is 50% of what number?

(2.) 9 is 25% of what number?

(3.) 9 is 10% of what number?

(4.) 9 is 75% of what number?

(5.) 9 is 150% of what number?

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