4 Pic 1 word R, C, E,T, R, F, S, P, N, O, A,E _ _ _ _ _ ___.

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Presentation transcript:

4 Pic 1 word R, C, E,T, R, F, S, P, N, O, A,E ___ __ ___ ___ ___ ___ ___

Done By: Mrs. Grant-Brooks Durham Bulls Math Percentages Done By: Mrs. Grant-Brooks Durham Bulls Math

Percents Group activity Discuss what you know about percents. Complete questions 1 and 2 in the table. What do you know about percent? What do you want to learn about percent? What have you learned about percent?

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Percent of a number Percent means per hundred or out of every hundred Examples: 20% of 200 students were already assigned lockers. 20 of first 100 20 of second 100 Total of 40 students were assigned lockers 20% of 200 is? 20 100 × 200 1 = 40 students Calculator (20 ÷ 100 ) × 200 = 40 students

Let’s estimate some percentages 100% = 100 100 =1 whole 50% = 50 100 = 1 2 (Split the number in 2 take 1 part) 20% = 20 100 = 1 5 (Split the number in ? take ? part) 25% = 25 100 = 1 4 (Split the number in ? take ? part) 10% = 10 100 = 1 10 (Split the number in ? take ? part) 75% = 75 100 = 3 4 (Split the number in ? take ? parts) 5% = 5 100 = 1 20 (Split the number in ? take ? part)

Lets try! 50% of 600 is? 10% X 80 is? 25% of 200 is? 20% of 600 is? Draw this table Estimate Calculate (Show working) 50% of 600 is? 10% X 80 is? 25% of 200 is? 20% of 600 is? 100% of 450? 80% of 3550?

More than a whole percentages Lets say that the school population for this year is 150% of what is was last year. If there were 800 students enrolled last year, how may students are enrolled this year? Now recall that 100% = 100 100 =1 whole So (100% +50%) X 800 is 800 + 400 =1200 students OR 150% of 800 150 100 × 800 1 =1200 students Calculator (150 ÷ 100 ) × 800 = 1200 students

Lets try! What is 200% of 95? 350% of 500 is? 415% of 3160?

Review finding percentage

Finding percentage Lets calculate the percentage for your quiz scores! Patrice got 16 questions correct of 20 questions. What percentage did she get from her test? 16 20 × 100% = 80% Lets calculate the percentage for your quiz scores!

Activity In pairs: Write what you have learned about percentages on your sheet. Write an example of percentage problem and solve it

Lets try! What percent of 29 is 3? What is 28% of 63? If 30% of the students in a class of 50 are boys? How many boys are in the class? How many girls?