Monday, October 17th

• Please take a new warm up and complete todays

• Write down the homework!

1.Find the prime factorization of 72?

2. Is 3,456 divisible by 4? Why?

Warm Up

Weekly Review Answers

Adding and Subtracting

26.56.610.4317

Multiplying and Dividing Decimals

35.73.51.23

Exponents

643^41

Data

LineBarCircle

Patterns

27 313242

Corny Joke of the Day

What do planets read

Comet Books

Schedule for the WeekToday: Review Quiz and Greatest Common Factor Notes Tuesday: Least Common Multiple Wednesday: (sub) GCF and LCM word problems, *Get study guide Thursday: (field trip) Study guide answers Friday: TEST (this could change)

Agree or Disagree1. The prime factorization of 24

would be 2 x 3 x 42. 233 is divisible by 4 because

the numbers add up to 83. The factors of 18 include

1,2,3,6,8, and 184. 63 is divisible by 7 5. Ms. Evans is from Minnesota

Quiz Answers These are very

similar to your TEST questions

Please stop and ask questions

When is the Test??!?!

Getting to know your partner

I want you to turn to the person sitting next to you and come up with at least 4 things that you both like

Are these commonalities more like:

Factors or Multiples What is one thing that we all like?

This is our GREATEST COMMON FACTOR

Our MissionTo find the Greatest Common

Factor between 2 or

more numbers

What is it?Greatest Common Factor

(GCF)- is the greatest (largest) of the common factors of two or more

numbers

There are 2 methods to finding the GCF

Method #1The Listing Method

Steps

1. Write down the factors of each number

2.Circle the common factors.

3. The largest one is the Greatest Common Factor, or GCF

Just WatchFind the GCF of 18 and 241. 18: 1, 2, 3, 6, 9, 18 24: 1, 2, 3, 4, 6, 8, 12, 242. Common factors: 1, 2, 3,

and 63. The GREATEST common

factor is 6!

You Try! Find the GCF of each set of

numbers 1. 16 and 24

2. 18 and 36

Is this method good?Advantages

This method is quick and easy for numbers we are

very familiar with 6, 8, 12, 10, 20

etc.

Disadvantages A huge disadvantage

to this method is that we can make mistakes very easily!

This is not the recommended method for solving most GCF problems.

Method #2

The Slide Method

The “Slide” method- The slide method helps us break numbers down by looking at common factors. It is very helpful for finding GCF

What it Looks Like24 and 36

Discuss in groups: How would you describe to find the GCF using the

Slide method

Steps to Slide Method 1. Begin by looking at

your two numbers- identify a common factor

2. Write the Common factor to the left, outside your “slide”

3. Divide all numbers by the common factor, and write them below the slide.

4. Look at your quotients from step 3- do you have any common

factors? If so repeat steps 2 and 3 until the quotients have no factors in common- it can take as many steps as you need to get there.

5. To find the GCF, multiply all the common factors (the numbers to the left outside the slide)

Let’s try together! a. 48 and 72

b. 96 and 112

AdvantagesIt’s the most

accurate and it helps with large

numbers. It is also the method we will

use for Least Common Multiple.

You Try! Complete the 6 problems

Choose any way you wish!

When you are done raise your hand and then help others in your group!

What if we have more than 2 numbers?

Use the slide method!

Do the same steps with three numbers!

Remember to pick a common factor for all 3 numbers!

16, 12 and 24

You Try! a. 24, 32 and 48

b. 120, 100, and 50

ANY QUESTIONS?!?!?!?!

WorktimeComplete

worksheet (evens)

You may choose any method of your choice

Complete in pencil

Remember

To Show Work!