Classroom ProceduresEntering the classroom:

Conversation – No, Voice level 0Help – Yes, raise your handActivity – Entering the classroom

– Independent seatworkMovement – Sharpen pencil

– Get supplies – Take your seat

Participation – Write (eyes ONLY on your own work)

– Listen, answer, ask questions, & shareSuccess – Agenda Complete – Warm-up complete – Great Job!

Classroom ProceduresCooperative Groups:

Conversation – Talk quietly to another student – Voice level 2 (Quiet voice)

Help – Ask any student in your group or cluster. – At least two people raise their hands.

Activity – Small group instruction

Movement – Sharpen pencil – While out of seat Do NOT talk to

another student

Participation – Listen, answer, ask questions, & share

– Take notes

Success – Excellent work!

Proportion Set-up

Teddy types 23 words per minute. How many words can Teddy type in 15 minutes? Write 4 proportion that can be used to find solve this problem.

10/18/12 Proportions

The student will…write and solve proportions

For the purpose of…applying proportions to real life problem situations

As measured by…100% success on independent guided practice

Classroom ProceduresDirect Instruction:

Conversation – No talking to another student – Raise your hand and wait to be

called onHelp – Yes, raise your hand.Activity – Whole-class Instruction (Students at desk)Movement – Sharpen pencil

– While out of seat Do NOT talk to another studentParticipation – Listen and take notes

– Listen, answer, ask questions, & shareSuccess – Great job, class! – Well done!

Vocabulary

Proportion:An equation that states that two ratios are equivalent.

Cross products:

Vocabulary Proportions

Scale model:The dimensions of a scale model are proportional to the dimensions of the actual object.

Scale:The scale gives the relationship between the model’s dimensions and the actual objects dimensions.

EXAMPLE 1 Writing and Solving Proportions

Renting MoviesOn Tuesday, you paid $7.47 to rent movies. On Friday, you rent 5 movies for a total of $12.45. Each movie costs the same amount to rent. How many movies did you rent on Tuesday?

SOLUTION

To find how many movies you rented on Tuesday, write a proportions.

1st Try Writing and Solving Proportions

Rhinoceros Beetles

An adult rhinoceros beetle weighs only 0.525 ounce but can carry about 446.25 ounces on its back. If a person were proportionately as strong as a rhinoceros beetle, how much weight could a 100 pound person carry?

446.25

0.525 = x100 Write a proportion

ouncesounces = pounds

pounds.

446.250.525 100 =

x100

100 Multiply each side by 100.

Simplify.85,000 x=

If human strength were proportional to that of a rhinoceros beetle, a 100 pound person could carry 85,000 pounds.

ANSWER

Practice Writing and Solving Proportions

Your Turn NowDirections: Solve the proportion

1. n15 = 2

3

2. 2816 = m

24

EXAMPLE 2 Using Cross Products

Original proportion

Cross products property

Multiply

Divide each side by the same number

Simplify

1st Try Using Cross Products

Directions: Solve the proportion. Then check your solution.

Practice Using Cross Products

Your Turn NowDirections: Solve the proportion. Then check you solution.

EXAMPLE 3 Standardized Test Practice

ANSWERThe length of the actual car is 9 feet. The correct answer is D.

Model CarYou are building a model car that has a total length of 6 inches. If the scale of this model is 1 inch to 1.5 feet, how long is the actual car?

SOLUTION

Write a verbal model

Write the proportion

Cross products property

1st Try Standardized Test Practice

SOLUTION

10 ft.1 in. =

15 ft.h in. Write a proportion.

10h = 15 Cross products property

h = 1.5 Divide each side by 10.

Scale Height of strawberry modelHeight of actual strawberry

=

Practice Standardized Test Practice

Your Turn Now

Classroom ProceduresGroups Discussion:

Conversation – Talk quietly to another student – Voice level 2 (Quiet voice)

Help – Raise your hand, and wait to be called on.

Activity – Whole-class discussion

Movement – Sharpen pencil – While out of seat Do NOT talk to

another student

Participation – Listen, answer, ask questions, & share

– Take notes

Success – Excellent work!

Classroom ProceduresIndependent Seat Work/ Test:

Conversation – Voice level 0 - No talking Help – Yes, raise your hand.Activity – Individual seatwork, teacher available to help.Movement – Sharpen pencil

– While out of seat Do NOT talk to another student.Participation – Read

– Write (eyes ONLY on your own work).Success – Excellent!