# Math

Math (X) - Rational Numbers (X)

## Rational Numbers: We Are Proportional (2007)

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This program provides students with a lively introduction to key concepts involved with triangles and quadrilaterals. It includes defining rational numbers as the ratio of two integers, defining rational numbers as a terminating or repeating decimal, the concept of proportional reasoning and examples of converting between decimals and rational numbers.

Middle
High
Length:
00:31

## Game Over Gopher

Hungry gophers are after the prized carrot. Defend the carrot by placing units on a coordinate grid. A finalist in the 2012 Serious Games Showcase & Challenge.

## 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.

## 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.

## I <3 Math: Integers - How do Positive and Negative Numbers Relate to Sea Level? (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 the dolphin jumping in and out of the water. An I <3 Math clip with no audio.

## Negative Number Basics: Ordering Negative Numbers from Least to Greatest

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Is -40 bigger than -10? When ordering negative numbers, don't get stuck on the "amount" of the number. Think about what that negative sign really means!

## Simplifying an Algebraic Expression

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Simplify expressions with rational numbers using the distributive property of multiplication. This student-generated video focuses on using the distributive property to create equivalent expressions when multiplying by negative numbers and fractions.

This resource is part of the Math at the Core: Middle School collection.

## Multiplying Positive and Negative Numbers | PBS Math Club

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Learn about multiplying positive and negative numbers with this eccentric family. This episode of Math Club illuminates the simple rules for multiplying signed numbers.

## Opposites | PBS Math Club: InstaCram

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Defining opposite numbers in 15 seconds using positive and negative integers on a number line with InstaCram from the Math Club.