3.3 Proportions

Determine When Two Rates Are Proportional

Day 3

Math Minute Directions• Work by yourself• You have 15 minutes to

complete and/or correct all 10 questions

• When you’re done…• Math Facts in a Flash• Accelerated Math• Incomplete work• D-11 Math Review

Raise your hand if you have a question!

Math Minute 10 ANSWER KEY

1. False2. True3. False4. 12/2, 8/8, 22

5. 3/86. 7. A8. 69. 1/610. 1/3

Math Minute Extension Time

• If you are an A-Team Member, you may go to the following websites:– Mathplayground.com– Funbrain.com

• If you are NOT an A-Team Member, your computer needs to be closed. You should be working on one of the following things:– Incomplete/missing work– D-11 Math Review 1.4 DUE FRIDAY– Extra Credit

Announcements• D-11 Math Review 1.4 DUE Friday• Math MAP test on Thursday• STAR Math Test on Monday• December Newsletters DUE Friday

Results from Last Class

Due to the Project Night, I didn’t get an opportunity to review your work.

Mr. Perez stated you needed review on #3 (% of a number) and #8 (52 weeks in a year) on Math Minute 9. That was the same for my 5th period as well.

Data from Chapter 3 Pre-Test# Section Skill

1 3.1 Ratio as a fraction in simplest form

2 3.1 Ratio as a fraction in simplest form

3 3.1 Find the unit rate

4 3.1 Find the unit rate

5 3.3 Tell whether the ratios form a proportion - expression

6 3.3 Tell whether the ratios form a proportion - expression

7 3.3 Tell whether the ratios form a proportion - in words

8 3.4 Write a proportion

9 3.4 Write a proportion

10 3.5 Solve the proportion using multiplication

11 3.5 Solve the proportion using multiplication

12 3.5 Solve the proportion using multiplication – Distributive Property

LEARNING TARGET3.3 Proportions – How can you tell when two ratios form a proportion?

Today I can determine if two rates are proportional using multiplication, division, or the Cross Products Property by correctly answering at least 2 out of 3 STUDENT questions.

TCAP STANDARDS1.4a Use the relationships among fractions, decimals, and percents, including the concepts of ratio and proportion, in problem-solving situations.

6.1a Use concrete materials or pictures to explain how ratios, proportion, and percents can be used to solve real-world problems.

AGENDA• (15 min) Math Minute 10• (10 min) Intervention/Extension• (5 min) Announcements & Results• (5 min) Lesson Overview• (10 min) 3.3 Lesson Warm-Up:

Equivalent Fractions• (20 min) MODEL Determine Whether

Two Ratios Form A Proportion (x & ÷)• (20 min) MODEL Using Cross Products• (5 min) Exit Ticket

KEY VOCABULARYUnit RateProportionCross Products Property

HOMEWORK & UPCOMING EVENTSMissing & Incomplete AssignmentsD-11 Math Review 1.4 DUE Friday

3.3 Lesson Warm-UpPick 1 Equivalent Fractions

1. Is 4/10 equivalent to 10/25? Explain.

2. Is 6/4 equivalent to 8/12? Explain.

3.3 Lesson Warm-UpPick 1 Equivalent Fractions

1. Is 4/10 equivalent to 10/25? Explain. Answer: Yes!

2. Is 6/4 equivalent to 8/12? Explain. Answer: No!

Lesson Check-In

Set-Up Your Record SheetWE DO

YOU DO

NameDatePeriod

p. 112

MODEL Determining ProportionsTEACHER: p. 112 Example 1A

Tell whether the ratios form a proportion.

MODEL Determining ProportionsTEACHER: p. 112 Example 1A

Tell whether the ratios form a proportion.

Answer: Yes

MODEL Determining ProportionsCLASS: p. 112 Example 1B & OYO #1

Tell whether the ratios form a proportion.

MODEL Determining ProportionsCLASS: p. 112 Example 1B & OYO #1

Tell whether the ratios form a proportion.

Answer: No

Answer: Yes

MODEL Determining ProportionsSTUDENT: p. 112 OYO #2-4

Tell whether the ratios form a proportion.

MODEL Determining ProportionsSTUDENT: p. 112 OYO #2-4

Tell whether the ratios form a proportion.

Answer: No

Answer: No

Answer: Yes

Lesson Check-In

Can We Always Use Multiplication and Division?

1. Go to p. 114 and look at the practice problems #5-16

2. Which questions can you use the method we just practiced? How do you know?

3. Which questions will require a different method? How do you know?

Cross Products Property

Virtual Nerd video

MODEL Using Cross ProductsTEACHER: p. 112 Example 1A

Tell whether the ratios form a proportion.

MODEL Using Cross ProductsCLASS: p. 112 Example 1B & OYO #1

Tell whether the ratios form a proportion.

MODEL Determining ProportionsSTUDENT: p. 112 OYO #2-4

Tell whether the ratios form a proportion.

Lesson Check-In

Exit Ticket

Tell whether the two rates form a proportion.

7 inches in 9 hours; 42 inches in 54 hours.