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# Prime Time Investigation 3 - PowerPoint PPT Presentation

Prime Time Investigation 3. Let’s Review Vocabulary. Multiple Common Multiple Factor Common Factor Greatest Common Factor. What are the first ten multiples of 20? Of 30? What numbers (multiples) occur on both lists? We call these common multiples.

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Presentation Transcript
Prime TimeInvestigation 3

Multiple

Common Multiple

Factor

Common Factor

Greatest Common Factor

What numbers (multiples) occur on both lists?

We call these common multiples.

What do these numbers have in common?

What is the least number that occurs on both lists? This number is called the least common multiple of 20 and 30.

Let’s define Least Common Multiple in our notebooks.

The least multiple that two or more numbers share.

Ex: 6 = 6, 12, 18, 24, 30, 36, 42, 48

8 = 8, 16, 24, 32, 40, 48

SO – common multiples are 24 & 48

The LCM is 24

What are the factors of 12? Of 30?

What numbers occur on both lists? We call these common factors.

What properties do these numbers have in common?

What is the greatest number on the list? This number is called the greatest common factor.

Let’s define greatest common factor in our notebooks.

The greatest number that is a factor of each or two or more numbers.

The factors of 12 are = 1, 2, 3, 4, 6, 12

The factors of 18 are = 1, 2, 3, 6, 9, 18

The greatest common factor is 6.

How many of you have ever been on a Ferris wheel?

How many trips around do you get?

How does the size of the wheel affect your ride?

Today we’re going to be solving a problem about a Ferris wheel ride.

• Switch partners with someone and use the P.A.L. strategy to discuss the problem.

• Did you like using P.A.L?

• In your own words in you notebook, write about how finding common multiples helped you solve the Ferris wheel problem.

Today, we are going to look at another situation that considers when two or more things will happen again at the same time. Your challenge is to find when two types of cicadas will appear at the same time.

Cicadas spend most of their lives underground. Some populations of cicadas come above ground every 13 years, while others come up every 17 years. Although cicadas do not cause damage directly to fruits and vegetables, they can damage orchards because the female makes slits in trees to lay her eggs.