- 97 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Directions' - jenski

**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

Directions

- Grab your iPad
- Log in to edmodo
- Define the vocabulary terms (using Math Glossary App):
- Integer
- Absolute Value
- Watch the video to review these key terms

Lesson 1: Opposite Quantities Combine to Make Zero

Objectives

- Students add positive integers by counting up and negative integers by counting down
- Students know the opposite of a number is called the additive inverse because the sum of the two numbers is zero.

Vocabulary

You should find these definitions in your Math Terms Glossary app.

- Integer
- Absolute Value

These terms are considered background knowledge and need to be known in order to move on with lesson 1.

Example 1

- Counting up corresponds to _positive_ numbers.
- Counting down corresponds to _negative_ numbers.

Where do you begin when locating a number on the number line? Zero

What do you call the distance between a number and 0 on a number line? Absolute Value

What is the relationship between 7 and -7? They are opposites

Example 2 – Using the Integer Game

- What is the final position on the number line?

Count up 5, count down 5, count down 4, count up 8 = 4

- What card or combination of cards would you need to get back to 0? -3 & -1, -5 & 1, 6 & -6, etc…
- How should arrows line up when counting on?

Example 3 – The Additive Inverse

- How far is 7 from 0 and in which direction?

7, to the right

- What is the opposite of 7?

-7

- How far is -7 from 0 and in which direction?

7, to the left

Teacher questions D-G

For all numbers 𝒂 there is a number –𝒂, such that 𝒂 + (−𝒂) = 𝟎.

The additive inverse of a real number is the opposite of that number on the real number line. For example, the opposite of −𝟑 is 𝟑. A number and its additive inverse have a sum of 0. The sum of any number and its opposite is equal to zero.

Example 4 – Real-World Examples (output side)

-10

- How would the value of this card represent a temperature?
- How would the temperature need to change in order to get back to 0 degrees?
- Create a story problem using money that represents the expression 200 + (-200).

Download Presentation

Connecting to Server..