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Friday 2/11 HW: NONE 1.Get out last nights HW 2.While I am checking, log onto the computer. 3.While waiting to log in, complete 6-2 B #1-8 in your packet!

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Presentation on theme: "Friday 2/11 HW: NONE 1.Get out last nights HW 2.While I am checking, log onto the computer. 3.While waiting to log in, complete 6-2 B #1-8 in your packet!"— Presentation transcript:

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2 Friday 2/11 HW: NONE 1.Get out last nights HW 2.While I am checking, log onto the computer. 3.While waiting to log in, complete 6-2 B #1-8 in your packet! 4.Lets try to all be on task so we can get through percents! Guess What? We actually did almost 2 sections yesterday! Hooray for you!

3 Percents Can you find the percent of a number?

4 Finding the percent of a number Lets say I wanted to find out what 80% of 35 is… First, I remember a few things: 1.I can solve any problem like this using a proportion or an equation. 2.When I set up a proportion, I always use this rule: Part over Whole: Part 80 = n Part Whole Whole 3. Use these 3 word clues: of indicates whole is indicates part what number indicates x Write this down in your notes before you continue on! Copy the example and what the 3 words mean! Write this down in your notes before you continue on! Copy the example and what the 3 words mean!

5 Lets take another look: If you received a 80% on a test and there were 35 questions, how many did you get correct? STEP 1: Identify the part and whole of the problem. What is 80% of 35? part whole STEP 2: Set up the proportion: (your percent is always over 100!) 35 is the total number of questions, or whole # of questions 80 = x Cross multiply and solve for x. You got 28 questions right!

6 Test # 2 Yikes! You earned a 16% on a test out of 50 questions. How many questions did you get correct? What is 16% of 50? - this question could also look like this: 16% of 50 is what number? STEP 1: Identify the part and whole of the problem. What is 16% of 50? part whole STEP 2: Set up the proportion: (your percent is always over 100!) 16 = x Cross multiply and solve for x. You got 8 questions right.

7 Give it a try! Write these in your notebook! 1.Find 67% of = x Start by writing an empty proportion. Then, write your percent of 100. Now, decide whether 90 is the part or whole. Remember: of means whole! Whole is the denominator! Remember: of means whole! Whole is the denominator!

8 Another Example: 2.Find 145% of = x Do you have an empty proportion? Is your percent over 100? 304.5

9 Complete these problems in your notebook. The answers are on the screen after # Find 38% of = x Find 47% of 900

10 Keep Working! 5. 60% of 10 is what number? 60 = x What number is 15% of 30? 15 = x

11 You are doing great! % of 150 is what number? 8. What number is 59% of 20?

12 Answers!

13 Now you know how to find the percent of a number using proportions! Now, complete 6-4 Practice B EVENS in your packet. Before you continue with the rest of the program, show me your finished work.

14 Test # 1…AGAIN! What is 80% of 35? You know how to solve this using a proportion, but I know you equations, so lets give it a whirl! Things to Remember: 1.I can solve any problem like this using a proportion or an equation. 2. Use these 3 word clues: of indicates whole is indicates part what number indicates x

15 Equation Method 3. Percent x Whole = Part What is 80% of 35? (.80) (35) = p Percent x Whole = Part = 28

16 Now you try it! 38% of what number is 400? Percent x Whole = Part ( ? ) ( ? ) = p Step 1: Enter percent as a decimal. (.38 ) ( ? ) = p Step 2: Enter the Whole (.38 ) ( 400 ) = p Step 3: Solve using Multiplication! = 152

17 Now you can find the percents of a number using equations! With your partner, complete 6-4 Practice B # using the Equation method!

18 Wonderful Work!


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