# Rational Numbers

## Competing for the Northern Hemisphere Games | Cyberchase

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In this video segment from Cyberchase, Harry decides he wants to compete in the Northern Hemisphere Games in New Orleans. He must compete in four events and score a total of 50 points to make the team. In each event, if he does well he can score high, but if he performs poorly, his score could become a negative number.

## Addition of Positive and Negative Integers

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Introducing a card game that your students can play in small groups to develop their addition skills. This video focuses on addition of positive and negative numbers and briefly touches on subtraction of integers.

This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers and is part of the Math at the Core: Middle School collection.

## The Number Line | PBS Math Club: InstaCram

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Explaining the correct placement of positive and negative integers on a number line in 15 seconds with InstaCram from the Math Club.

## Parenthesis | PBS Math Club: InstaCram

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Describing how parenthesis ( ) symbols can be used for separating number signs from operations in 8 seconds with InstaCram from the Math Club.

## Adding Negative Numbers | PBS Math Club

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Challenge your knowledge of addition of positive and negative integers with this YouTube quiz from the PBS Math Club.

## What is an Integer? - Quiz | PBS Math Club

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Challenge your knowledge of positive and negative integers with this YouTube quiz from the PBS Math Club.

## Using a Coordinate Grid

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In this video segment from Cyberchase, the CyberSquad have become separated on an island. In order to find each other they bring up a map on their Skwak Pads and try to compare positions using a coordinate grid and landmarks on the map.

## Planning a Paper Route

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Harry agrees to take over his brother Pete's paper route for a week. After starting the job, he realizes the route was not planned out very well. He tries to rework it by analyzing the list of addresses. After making some adjustments to his list, he is able to create a new, easier and more efficient route.

## Comparing Decimals: Digits to the Right of the Decimal

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It's easy to get confused by the number of digits to the right of decimal when comparing. Is it a tenth, hundredth, or thousandth? This video will help!

## Mixed Numbers and Improper Fractions: Mixed Number or Improper Fraction on a Number Line

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Fraction or mixed number--either way you should end up on the same spot on the number line. Give it a try!