# Rational Numbers

## Why a Negative Times a Negative is a Positive

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Use the distributive property to understand the products of negative numbers.

## Multiplying Positive and Negative Numbers

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Learn some rules of thumb for multiplying positive and negative numbers.

## Multiplying and Dividing Negative Numbers: Multiplying Numbers with Different Signs

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Learn how to find the product of numbers with different signs.

## WorkKeys Applied Mathematics | Level 6

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Level 6 of the WorkKeys Applied Mathematics assessment requires learners to solve complicated problems. These videos and worksheets are designed to help learners apply mathematical reasoning, critical thinking, and problem-solving techniques to work-related problems.

These resources are part of KET’s Applied Mathematics: Resources for WorkKeys® and GED® Preparation collection.

## Finding the Intersection

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In this video segment from Cyberchase, the CyberSquad is looking for a lost Transformatron. Matt can see it along one line, while Jackie says she can see it along a different line. Digit and Inez try to figure out how this is possible, and they discover that one point can lie on two different lines.

## Numbers on a Number Line | PBS Math Club: InstaCram

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Illustrating the rules of addition of positive and negative numbers with a number line in 15 seconds with InstaCram from the Math Club.

## Importance of the Origin | Cyberchase

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In this video segment from Cyberchase, the CyberSquad is trying to rescue the Cyberspace Council, which is being held captive by Hacker. Motherboard has let the squad know that the council is on the 18th level of a very tall building. The squad has to figure out which floor that is without entering the building.

## Negative Number Word Problem: Difference between Temperatures

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Use a number line to determine how many degrees difference there is between coldest and warmest recorded outside temperatures.

## Harry Makes a Big Splash with Positive and Negative Numbers

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In this Cyberchase video, Harry, his friend, and his cousin Harley form a swim relay team. They get timed in three different strokes to see who should swim which one in a relay. They look at the results and try to find the combination of times which will yield the lowest overall relay time. In the accompanying classroom activity, students pair up and play a game that gives them practice adding positive and negative numbers on a number line.

## Absolute Value

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This animated Math Shorts video explains absolute value, as demonstrated on the number line and through a real-life example. In the accompanying classroom activity, students watch the video and then play a game in which they move a penny along a number line in positive and negative directions. As they play, they use absolute value to track the total distance that the penny moves. To get the most from the lesson, students should be comfortable determining distance between positive and negative numbers on a number line. This resource is part of the Math at the Core: Middle School Collection.