1. PARKLAND 2012-2013 4.3PERCNET OF A NUMBER

2. USE MENTAL MATH TO FIND THE PERCENT OF A NUMBER

3. SHOW YOU KNOW

4. CALCULATE THE PERCENT OF A NUMBER A survey showed ¼% of 800 students use inline skates to get to school. How many students skate to school?

5. 30 ¾ % of 400 students surveyed said they own a cell phone How many students own a cell Phone?

6. You have $40.12 in a savings plan. At the end of 1 year you will have 120% of what you started with. How much money will you have at the end of 1Year.?

7. SHOW YOU KNOW

8. Remember you can always use proportions or decimals

9. USING A PROPORTION Set up a proportion that uses the percent over 100. Cross multiply to write an equation. Solve the equation. To set up your proportion, think, “IS over OF equals PERCENT over 100.”

10. EXAMPLE – WHAT IS 20% OF 30? = 20 100 part whole 30 x = 100x 30(20) = 100x 600 100 = x6

11. USING A DECIMAL Change the percent to a decimal. Multiply that decimal by the number you are finding the percent of.

12. EXAMPLE – WHAT IS 18% OF 70? 18% = 0.18 0.18 x 70 = 12.6

13. 3. A. THERE IS A DISCOUNT OF 25% OFF ON A $60 PAIR OF SHOES. HOW MUCH ARE THE SHOES? $45 d. Why is forty-five dollars correct? $60 x.25 300 120 $15.00 $60 - 15 $45

14. 4. A. A SHIRT COST $30 PLUS 7% TAX. WHAT IS THE TOTAL COST? $32.10 d. Why is thirty-two dollars and ten cents correct? $30 x.07 $2.10 $30.00 + 2.10 $32.10

15. 5. A. A $300 BIKE IS ON SALE. HOW MUCH IS THE COST? $225 d. Why is two hundred twenty-five dollars correct? $300 x.25 1500 60 $75.00 $300 - 75 $225