Tuesday, Oct 30

5 Minute CheckComplete on the back of your homework. 1. Find 6% of 95.2. Find 28% of 575.3. Find 0.6% of 36.4. Find 0.03% of 1500.

5 Minute CheckFind 6 % of 95.

95 x .06 570 0000 5.70

5 Minute CheckFind 28 % of 575.

5 Minute CheckFind 28 % of 575.

28 ? 100 = 575 7 ? 25 = 575

7x575=3500+490+35=402525=161

5 Minute CheckFind 28 % of 575.

575 x .28 4600 11500 161.00

5 Minute CheckFind 0.6 % of 36.

5 Minute CheckFind 0.6 % of 36.

0.6 ? 100 = 36

0.6 x36 = 21.6 100 =0.216

36 0 decimals x .6 1 decimal 21.6 1 decimal 5 Minute CheckFind 0.6 % of 36.

.006 x 36 36 180 .216

5 Minute CheckFind 0.03 % of 1500.

5 Minute CheckFind 0.03 % of 1500.

0.03 ? 100 =1500

0.03 x1500 = 45 100 = 0.45

1500 0 decimals x .03 2 decimals 45.00 2 decimals 5 Minute CheckFind 0.03 % of 1500.

1500 x .0003 4500 00000 .45

Binder OrganizationTuesday, Sept 16Lesson 6.2.8

Solve Percent ProblemsSolve Percent ProblemsObjective: To solve percent problems which involve finding the whole or part.

Solve Percent ProblemsThe method to find a percent of a number uses a proportion.

A proportion is when two fractions are equivalent.

3 75 4 = 100

Solve Percent Problems10 is 25% of what number?

Solve Percent Problems10 is 25% of what number?

In other words,25% of what number is 10, or25% of ? is 10

Solve Percent Problems10 is 25% of what number?

If 25% of what number is 10, will that what number be bigger or smaller than 10?

Solve Percent Problems10 is 25% of what number?Yesterday when we found 25% of 10 the proportion was: 25 ? 100 = 10

Notice the small number is on top.

Solve Percent Problems10 is 25% of what number?Since we know the answer to the above question will be bigger than 10, then the proportion is: 25 10 100 = ?Notice the small numbers are still on top, since we determined the answer would be bigger than 10.

Solve Percent Problems10 is 25% of what number?

The method to solve these types of problems is the same as the method we learned yesterday, only the unknown will be in the denominator of the 2nd fraction.

Solve Percent Problems10 is 25% of what number?parts 25 10 100 = ? wholesTo Solve Percent ProblemsStep 1 Set up the proportion, with the parts on top and the wholes on the bottom.

Solve Percent Problems10 is 25% of what number?

1 10 4 = ?

To Solve Percent ProblemsStep 2 Simplify, if possible.

Solve Percent Problems10 is 25% of what number?

1 10 4 = ?

To Solve Percent ProblemsStep 3 Cross multiply and divide.

4 x 10 = 40 1 = 40

Solve Percent Problems30 is 50% of what number?

Step 1?

Solve Percent Problems30 is 50% of what number?

50 30 100 = ?

Step 2?

Solve Percent Problems30 is 50% of what number?

1 30 2 = ?

Step 3 ?

Solve Percent Problems30 is 50% of what number?

1 30 2 = ?

2 x 30 = 60 1 = 60

Solve Percent Problems30 is 50% of what number? x? 1 30 2 = ?

But, before you use this method try and find a multiplier or divider.

Solve Percent Problems90 is 75% of what number?

Step 1 ?

Solve Percent Problems90 is 75% of what number?

75 90 100 = ?

Step 2 ?

Solve Percent Problems90 is 75% of what number?

75 90 100 = ?

3 90 4 = ?

Step 3?

Solve Percent Problems90 is 75% of what number?

75 90 100 = ?

3 90 4 = ?

4 x 90 = 360 3 = 120, or you might have noticed

Solve Percent Problems90 is 75% of what number?

75 90 100 = ? x 30 3 90 4 = ?

Solve Percent Problems60 is 20% of what number?

Do this on your own.

Solve Percent Problems60 is 20% of what number?

20 60 100 = ?

1 60 5 = ?

5 x 60 = 300 1 = 300

Solve Percent Problems60 is 20% of what number? x3 20 60 100 = 300 x3

Solve Percent Problems10 is 40% of what number?

(Do this on your own)

Solve Percent Problems10 is 40% of what number? 40 10 100 = ? 2 10 5 = ?

5 x 10 = 50 2 = 25

Solve Percent Problems10 is 40% of what number? 4 40 10 100 = 25 4

If you got 4, what did you do?

Solve Percent Problems10 is 40% of what number? 25

You probably set up your proportion incorrectly,(10 on bottom instead of on top)

Solve Percent ProblemsWhat number is 40% of 60?

(Do this on your own)

Solve Percent ProblemsWhat number is 40% of 60?

40 60 100 = ? 2 60 5 = ?

5 x 60 = 300 2 = 150

Solve Percent ProblemsWhat number is 40% of 60?

40 ? 100 =60 2 ? 5 = 60

2 x 60 = 120 5 = 24

Solve Percent ProblemsWhat number is 40% of 60?

40 ? 100 = 60

x 12 2 24 5 = 60 x 12

Solve Percent ProblemsWhat percent of 120 is 120?

(Do this on your own)

Solve Percent ProblemsWhat percent of 120 is 120?

? 120100 = 120

? 120100 = 120

100 x 120 = 1200 120 = 100%

Since the answer is a percent, the ? must be in the percent fraction (over 100). Solve Percent ProblemsWhat percent of 600 is 12?

(Do this on your own)

Solve Percent ProblemsWhat percent of 600 is 12?

? 122nd number in the question100 = 600 1st number in the question

? 1100 = 50

100 x 1 = 100 50 = 2%

Solve Percent ProblemsWhat percent of 600 is 12? 6 2 12 100 = 600 6

Solve Percent Problems40 is 20% of what number?

(Do this on your own)

Solve Percent Problems40 is 20% of what number? x220 40 100 =200 x2

Solve Percent Problems40 is 20% of what number?

20 40 100 = ?

1 40 5 = ?

5 x 40 = 200 1 = 200

Solve Percent ProblemsWhat percent of 300 is 45?

(Do this on your own)

Solve Percent ProblemsWhat percent of 300 is 45? 3 15 45 100 =300 3

Solve Percent ProblemsWhat percent of 300 is 45?

? 45 2nd number in the question 100 = 3001st number in the question

? 3 100 = 20

100 x 3 = 300 20 = 15

Solve Percent ProblemsMolly has $10 in her wallet. If this is 20% of her monthly allowance, what is her monthly allowance?

(Do this on your own)

Solve Percent ProblemsMolly has $10 in her wallet. If this is 20% of her monthly allowance, what is her monthly allowance? 2 20 10 100 = 50 2

Her monthly allowance is $50.

Solve Percent ProblemsMolly has $10 in her wallet. If this is 20% of her monthly allowance, what is her monthly allowance? 20 10 100 = ?

1 10 5 = ?

10 x 5 = 50 1 = 50

Her monthly allowance is $50.

Solve Percent ProblemsBefore 1982 pennies were 95% zinc and 5% copper. If 100 pennies minted in 1980 have an approximate mass of 15 grams of copper, what is the total mass of 100 pennies?

Do this on your own.

Solve Percent ProblemsBefore 1982 pennies were 95% zinc and 5% copper. If 100 pennies minted in 1980 have an approximate mass of 15 grams of copper, what is the total mass of 100 pennies? x 3 5 15 100 = 300 x 3

300 g. is the total mass

Solve Percent ProblemsBefore 1982 pennies were 95% zinc and 5% copper. If 100 pennies minted in 1980 have an approximate mass of 15 grams of copper, what is the total mass of 100 pennies? 5 15 100 = ?

1 15 20 = ?

20 x 15 = 300 1 = 300

Solve Percent ProblemsUsing what you know about percents, explain why a commercial that says 80% of dentists when asked used this toothpaste might be misleading.

Do this on your own.

Solve Percent ProblemsUsing what you know about percents, explain why a commercial that says 80% of dentists when asked used this toothpaste might be misleading.

You do not know how many dentists were asked. It could have been 4 out of 5, or 80 out of 100, or 800 out of 1000.

Solve Percent ProblemsThe purity of gold is listed in karats. Refer to the table. If a necklace is 75% gold, what karat is it? Explain your reasoning.

Do this on your own.

Solve Percent ProblemsThe purity of gold is listed in karats. Refer to the table. If a necklace is 75% gold, what karat is it? Explain your reasoning. 18 karats; 24 is the whole and 75 the percent.

75 18 100 = 24

Solve Percent ProblemsOmar scored an 82% on his first test of the quarter. Will a score of 38 out of 50 on the second test help or hurt his grade? Explain your reasoning.

Do this on your own.

Solve Percent ProblemsOmar scored an 82% on his first test of the quarter. Will a score of 38 out of 50 on the second test help or hurt his grade? Explain your reasoning.

38 out of 50 is 76%. Since that is less than his first score, it will hurt his grade.

Solve Percent ProblemsAgenda NotesHomework Homework Practice 6.2.8Circle your answers

Chapter 6.2 TestThursday, Sept 18Accum Review 2 due Thursday, Sept 18