Loading in 5 sec....

INTEGERS AND MULTIPLICATIONPowerPoint Presentation

INTEGERS AND MULTIPLICATION

- 57 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' INTEGERS AND MULTIPLICATION' - tirzah

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### INTEGERS AND MULTIPLICATION

### What do you notice about multiplying integers???

### INTEGERS AND DIVISION

### What do you notice about dividing integers???

### SUMMARYOn comp book page

The University of Texas at Dallas

MULTIPLICATION

- Red and yellow tiles can be used to model multiplication.
- Remember that multiplication can be described as repeated addition.
- So 2 x 3 = ?

2 groups of 3 tiles = 6 tiles

The University of Texas at Dallas

MULTIPLICATION

- Since 2 x 3 = 6 and 3 x 2 = 6, does it make sense that -3 x 2 = -6 ?
- -3 x 2 = -6 is true.
- +2 x -3 = -6 and -3 x +2 = -6 belong to a fact family:
- Write the fact family on comp book page_____

+2 x -3 = -6

-3 x +2 = -6

-6 ÷ +2 = -3

-6 ÷-3 = +2

The University of Texas at Dallas

MULTIPLICATION

- Use your tiles to model each multiplication problem.
- +2 x +4 = ?

ANSWER

2 groups of +4

+2 x +4 = +8

The University of Texas at Dallas

MULTIPLICATION

- -2 x +4 = ?

ANSWER

4 groups of -2

-2 x +4 = -8

- Use the fact family for
- -2 x +4 = ? We can’t show -2 groups of +4
- +4 x -2 = ? we can show 4 groups of -2

The University of Texas at Dallas

MULTIPLICATION

- +1, -1 are opposites
the products are opposite

- Since +2 and -2 are opposites of each other,
- +2 x -3 and -2 x -3 have opposite products.

+1 x +3 = +3

-1 x +3 = -3

The University of Texas at Dallas

MULTIPLICATION

- To model -2 x -3 use 2 groups of the opposite of -3

-2 x -3 = +6

The University of Texas at Dallas

MULTIPLICATION

- Use tiles to illustrate -3 x -4 =?

ANSWER

3 groups of +4 (the opposite of -4)

-3 x -4 = +12

The University of Texas at Dallas

On comp book page ____ write a few sentences about what you noticed.

The University of Texas at Dallas

DIVISION

- Use tiles to model +12 ÷ +3 = ?

4 yellow tiles in each group.

Divide 12 yellow tiles into 3 equal groups

+12 ÷+3 = +4

The University of Texas at Dallas

DIVISION

- Use tiles to model -15 ÷ +5 =?

Divide -15 into 5 equal groups

-15 ÷+5 = -3

The University of Texas at Dallas

DIVISION

- Write the fact family
- -4 x +2 = -8
- Compare your answer.
- +2 x -4 = -8
- -8 ÷ +2 = -4
- -8 ÷ -4 = +2

The University of Texas at Dallas

DIVISION

-12 divided into 6 equal groups

7) -12 ÷+6

= -2

8) -8 ÷+2

= -4

-8 divided into 2 equal groups

The University of Texas at Dallas

On comp book page ____ write a few sentences about what you noticed.

The product or quotient of two integers with different signs is negative.

The product or quotient of two integers with the same sign is positive.

Download Presentation

Connecting to Server..