properties of numbers prime time! squares! puzzles

Properties of NumbersPrime Time!

Squares!Puzzles

Shelby ordered cases of snack crackers for her Math Club meetings. Each case had 20 packages of snack crackers in it. If Shelby ordered 3 cases of snack crackers in March and 2 cases of snack crackers in April, how many packages of snack crackers did Shelby order in all?

A. 60

B. 100

C. 40

D. 25

Let’s review factors

What are factors?If I want to find all the

factors of a certain number,

what number do I start with?How do we know when

to stop?

Let’s Review some other things we’ve learned

• What are some multiplication combinations we can use to build arrays for the number 12?

Learning Goals

• Identify a number as prime or composite• Identify square numbers

• Use number characteristics such as these to solve problems.

Guiding Questions

How can number properties help me solve problems?

How can number properties help me decide which strategy to use?

Focus

• There are some numbers that only have one array (one multiplication combination). Turn and talk with your partner, and see if you can find four of them.

These numbers have a special name, does anyone know what it is?

Prime Numbers

• Those numbers are called “Prime Numbers”. Turn and talk with your partner, and come up with a definition for Prime Numbers.

Composite Numbers

• Numbers with more than one multiplication combination are called Composite Numbers. Turn and talk with your partner to identify some of these numbers.

SQUARE NUMBERS• Now, let’s see if we can create a square out of an

array. First you have to know what makes a square a square….hmmm

• Can you and your partner use the tiles to come up with an array that is a square? Try It!

These are called “square” numbers. Talk with your partner, and seeif you can come up with a definition for square numbers!

Puzzle Time!

• Because you are all so awesome at Math, you are now going to work on a number puzzle!

• Your answer must fit the clue.

Ready?

• This number of tiles will make a rectangle that is 2 tiles wide.

Use your tiles to model some numbers.Then draw the array in your journal and

label the dimensions! Don’t forget to write the equation!

Sharing Strategies

• What strategies did you use to solve the problem? Use chart paper and markers and use a flow map to show your thinking.

Sam, Toni and Carla started an exercise program. Sam walks 5 miles per week. Toni walks 8 miles per week. Carla walks 4 miles per week. How

many miles will the walk in 2 weeks?

A. 34

B. 13

C. 17

D. 26

Let’s Review Our Learning Goals

• Identify a number as prime or composite

Identify square numbers

Use number characteristics such as these to solve problems

Guiding Questions

How can number properties help me solve problems?

How can number properties help me decide which strategy to use?