7 th grade math week of 11/17/14 information from : purple math, holt rinehart winston tb,...

7th Grade MathWeek of 11/17/14

Information from :

Purple Math, Holt Rinehart Winston TB, Math-Aides

http://net.cmsdnet.net/schools/math/sld005.htm

http://www.mathsisfun.com/

https://www.sinclair.edu/centers/tlc/pub/handouts_worksheets/mathematics/DEV085/7_integers/

085_signed_integer_word_problems.pdf

Monday: Bell Work

Write and solve the inequality.

Max's employer has at most $18.00 to spend on tape measures for his crew. How many can he buy with that amount if each tape measure costs $4.50?

Solve and graph the inequality.

8h < -96

Agenda

1- bell work

2- Agenda *HW- TB p. 266 1-10

3- vocabulary word of the day

4- Objective

5- lesson – Ratios/ Rates

6- exit ticket

22. Quantity

What does this word mean to you?

This word actually means…..total value of a given group or specific amount.

Examples… Explain how you would use this word in math.

Lesson

7. RP.2. Recognize and represent proportional relationships between quantities.

Ratios Ratios

A ratio compares values.

A ratio says how much of one thing there is compared to another thing.

There are 3 blue squares to 1 yellow square

Ratios can be shown in different ways:

Using the ":" to separate the values: 3 : 1 Instead of the ":" we can use the word "to": 3 to 1 Or write it like a fraction: 3

1

A ratio can be scaled up:

Here the ratio is also 3 blue squares to 1 yellow square,even though there are more squares.

Using Ratios

The trick with ratios is to always multiply or divide the numbers by the same value.

Example:

4 : 5 is the same as 4×2 : 5×2 = 8 : 10

Recipes

Example: A Recipe for pancakes uses 3 cups of flour and 2 cups of milk.

So the ratio of flour to milk is 3 : 2

To make pancakes for a LOT of people we might need 4 times the quantity, so we multiply the numbers by 4:

3×4 : 2×4 = 12 : 8

In other words, 12 cups of flour and 8 cups of milk.

The ratio is still the same, so the pancakes should be just as yummy.

Try this!!

Types of Ratios

Part to Part: compare two parts in the groupExample: 10 boys to 8 girls

Part to Whole: compare a part to a wholeExample: 10 boys to 18 students

These ratios are shots made to shots taken (answer the following)

1) Are these part to part or part to whole?2) Who is the best at freethrows?3) List the ratios from least to greatest.

Rates Rates

A rate is a little bit different than the ratio,

it is a special ratio. It is a comparison of

measurements that have different units,

like cents and grams. A unit rate is a rate

with a second quantity of 1.

Rate Examples

For example, if a 12-ounce can of corn costs 69¢, the rate is 69¢ for 12 ounces. The first term of the ratio is measured in cents; the second term in ounces. You can write this rate as 69¢/12 ounces or 69¢:12 ounces. Both expressions mean that you pay 69¢ "for every" 12 ounces of corn.

Ad Task

You are the CEO of one of the major grocery stores. You were asked to come up with a new advertisement for the food you will be selling during the holiday season. Your ad has to include:

1. The rate of the item.

2. The unit rate of the item.

3. A comparison the other major grocery stores.

4. A drawn picture of the item.

Instructions

1. Find an item you want to sell from the given newspaper.

2. Create a rate of that item (price to ounces or pounds)

3. Calculate the unit rate of that item.

4. Compare that to the original item you found the newspaper.

5. Create an AD to represent the item.

Lesson Review

Exit / Closure

• On a sticky note write answer the following question.

-What is the difference between a rate and a ratio?

Tuesday: Bell Work *HW on deskWrite and solve the inequality.

Last Friday Marissa had $22.50. Over the weekend she received some money for cleaning. She now has over $32.00. How much money did she get for cleaning?


7x + 3 ≥ 40

Agenda

1- bell work

2- Agenda *WB p. 35-36


4- Objective

5- Check Homework

6- lesson *Writing/Identifying Proportions

7- exit ticket

23. Coefficient


This word actually means…..the number that is multiplied by the variable in an algebraic expression/equation.


Lesson


Rates Rates

A rate is a little bit different than the ratio,

it is a special ratio. It is a comparison of

measurements that have different units,

like cents and grams. A unit rate is a rate

with a second quantity of 1.

Rate Examples

For example, if a 12-ounce can of corn costs 69¢, the rate is 69¢ for 12 ounces. The first term of the ratio is measured in cents; the second term in ounces. You can write this rate as 69¢/12 ounces or 69¢:12 ounces. Both expressions mean that you pay 69¢ "for every" 12 ounces of corn.

Lesson Review

Wednesday: Bell Work

Write and solve the equation or inequality

At a restaurant, Daphne and her three friends, Amber, Jason and Wilson decided to divide the bill evenly. If each person's part exceeded $13.00, what was the total bill?


K – 9 ≤ 894

Agenda

1- bell work

2- Agenda *in class problems- no homework


4- Objective

5- Check Homework

6- lesson *Solving for proportions

7- exit ticket

24. Variable


This word actually means…..a symbol used to represent a quantity that can change.


Lesson


Identifying/ Writing Proportions

Use what you know About proportions to Put these numbersIn order to create a proportion

TB p. 224

Exit/ Closure

Discuss with your neighbor...

Would it be better to earn $272 in 40 hours or $220 in 30 hours?

Why??

Exit/ Closure

Discuss with your neighbor...

How do you feel about your understanding of rate and unit rate?

*Decide as a team where you will place your Ad to illustrate your understanding of the lesson.

Thursday: Bell WorkWrite and solve the equations or inequalities

Sara goes to Fredonia University. She has $900 in her savings account. She needs to buy a small laptop computer before the next semester. The laptop costs $600. Every 2 weeks she withdraws $60 from her savings account for food. How many times can Sara withdraw money for food? Write an inequality to explain.


X + 12 > 102 5

Agenda

1- bell work

2- Agenda *finish problems if needed


4- Objective

5- lesson *N2K and Unit Rate

6- exit ticket

25. Reciprocal


This word actually means…..one of two numbers whose product is one.


Lesson


Solving proportions

If twelve inches correspond to 30.48 centimeters, how many centimeters are there in thirty inches?

I will set up my ratios with "inches" on top, and will use "c" to stand for the number of centimeters for which they've asked me.

inches:centimeters: 12 = 30 30.48 c

12 = 30 30.48 c

12c = (30)(30.48) 12c = 914.4 c = 76.2

Thirty inches corresponds to 76.2 cm.

Contextual Proportion Problems

Exit / Closure

Partner discussion with your neighbor (s)

What type of equation do you write when solving proportions?

Friday

Lesson

7.RP.1 Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in each ¼ hour, compute the unit rate as the complex fraction 1/2/1/4 miles per hour, equivalently 2 miles per hour.

• N2K 2

Unit Rates

Video

Additional videos

1

2

Word Problems

Solve the word problems

Need to Know 2

CT-

Solve the problem and choose the most correct answer. JUSTIFY your Answer in words!!!

CR-

Look at the work in the problem. Choose the answer that does not work With the given problem. JUSTIFY in words as to why that answer does notCan not be used with the problem.

Exit / Closure

• Partner discussion with your neighbor (s)

What skills were important for this need to know? What were your strengths or weaknesses?

7 th grade math week of 11/17/14 information from : purple math, holt rinehart winston tb,...

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