# Rational Numbers

## Negative Number Basics: Negative Numbers and Number Lines Examples

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Given a few negative numbers on a number line, determine what negative numbers are elsewhere on the number line.

## Graphing Points on a Coordinate Plane: Harry’s Feet Compete

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In this video from Cyberchase, Harry decides he needs to start a regular workout schedule. He uses a graph to record his progress. In the accompanying classroom activity, students play a ball-balancing game and record their attempts on a graph to build on the concepts presented in the video. This resource is part of the Math at the Core: Middle School Collection.

## Adding Negative Numbers | PBS Math Club

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Introducing adding positive and negative integers, additive inverses, visualizing addition with a number line, and the commutative property of addition the Math Club parodies Star Wars and Mean Girls.

## Manipulating Graphs

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Watch how a graph is altered when key elements of the equation change. This lesson focuses on how to manipulate the equation of a line in slope intercept form to match the graphs provided deepening the understanding of both the slope and y intercept's role in the expression. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

## I <3 Math: Integers - How do Positive and Negative Numbers Relate to Temperature? (Video-Only Clip)

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Providing the opportunity to apply knowledge about positive and negative integers by narrating the clip. Students can describe how integers are represented on a number line as they relate to temperature. An I <3 Math clip with no audio.

## Commutative Property of Addition | PBS Math Club: InstaCram

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Demonstrating the Commutative Property of Addition with a number line in 10 seconds with InstaCram from the Math Club.

## Thinkport | Opposite Quantities and Zero Pairs

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Explore numerical opposites by considering the trajectory of a hot air balloon as it rises and falls in this video from MPT. In the accompanying classroom activity, students watch the video and then play a game in which they move a button along a number line in positive and negative directions. They find the total amount that the button travels in each direction in order to end up where it started. To get the most from the lesson, students should have some experience finding the distance between positive and negative integers on a number line. For a longer self-paced student tutorial using this media, see "Opposite Quantities and Zero Pairs" on Thinkport from Maryland Public Television.

## Absolute Value: Absolute Value Word Problems

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Here are a few word problems that ask us to apply our new absolute value knowledge.

## Absolute Value: Comparing Absolute Values - Concepts of "Greater Than" (>) and "Less Than (<)

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When we compare numbers we use the concepts of greater than (>), less than (

## Absolute Value: Integers

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Let's mix a little algebra into our discussion of absolute value. If we are looking for the |x|, if we know what x equals, we can do it.