**Percents**. Means “per 100”. It tells you a ratio “out of 100”. If there are 80% of the people in a school with black hair, then for every 100 people in the school, 80 of them have black hair.

A **Decimal fraction** is a fraction (as 25/100) in which the denominator is a power of 10.

Recall that **a percent** shows a part out of 100 (a percent is a decimal fraction with a denominator of 100). A percent means **how many for each 100**.

**50% means ‘half of’**and 25% means ‘a quarter of’.

Thus, if we know any two of these three quantities, it is easy to calculate the third one.

**There are three basic types of percent problems:**** **

**Type 1: Finding the Percent (%) or Rate**

**Type 2: Finding the Part**** **

**Type 3: Finding the Base or Whole**

Example: From a group of 30 students 50% are taking math. The number of students taking Math is 30 x 50/100 = 15 (half of 30)

**Percent formula**

**Percent change**

Create a graphic organizer (Frayer Model) for the following vocabulary words: Percent, Percent of change, Percent Increase, Percent Decrease, Tax, Commission, Tip, Mark-up, Discount.