a. Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.

b. Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions of proportional relationships.

c. Represent proportional relationships by equations. For example, if total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn.

d. Explain what a point (x, y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0, 0) and (1, r) where r is the unit rate.

Title | Description | Thumbnail Image | Curriculum Topics |
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## Construction Site Math: Ratios |
## DescriptionIn this real-world application of ratios, students will learn what a ratio is, including ratios with three terms. They will see different ways of writing ratios, including fractions in simplest form. |
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## Closed Captioned Video: Percents: Applications of Percent -- Grade |
## Closed Captioned Video: Percents: Applications of Percent -- GradeVideo Tutorial: Applications of Percent -- Grade. In this video we investigate the concept of the grade of a road. This is an application of percents, where the slope of a road or a ski slope is written in percent form. We interpret this percent measurement as a slope measurement. |
Percents | |

## Closed Captioned Video: Percents: Calculating Commissions and Tips |
## Closed Captioned Video: Percents: Calculating Commissions and TipsVideo Tutorial: Percents: Calculating Commissions and Tips. In this video we look at using percent formulas to calculate sales commissions and tips. Various real-world scenarios are investigated for calculating these percent-based amounts. |
Percents | |

## Closed Captioned Video: Percents: Calculating Tax |
## Closed Captioned Video: Percents: Calculating TaxVideo Tutorial: Percents: Calculating Tax. In this video we look at using tax rates to calculate tax owed. The tax rates are written as percents and converted to decimals to calculate the tax. |
Percents | |

## Closed Captioned Video: Percents: Multiple Percents |
## Closed Captioned Video: Percents: Multiple PercentsVideo Tutorial: Percents: Multiple Percents. In this video, we investigate calculating the percent of a percent. Multiple calculations of a percent are investigated relative to a combined percent calculation. |
Percents | |

## Closed Captioned Video: Percents: Percent Decrease |
## Closed Captioned Video: Percents: Percent DecreaseVideo Tutorial: Percents: Percent Decrease. In this video, we look at the concept of percent decrease. The formula for calculating percent decrease is shown and used in the context of solving real-world problems. |
Percents | |

## Closed Captioned Video: Percents: Percent Increase |
## Closed Captioned Video: Percents: Percent IncreaseVideo Tutorial: Percents: Percent Increase. In this video, we look at the concept of percent increase. The formula for calculating percent increase is shown and used in the context of solving real-world problems. |
Percents | |

## Closed Captioned Video: Percents: Percents and Multiples of Numbers |
## Closed Captioned Video: Percents: Percents and Multiples of NumbersVideo Tutorial: Percents: Percents and Multiples of Numbers. In this video, we explore the difference between percent growth and the multiple of a number. Several real-world examples are used to explore these differences. |
Percents | |

## Closed Captioned Video: Percents: Probabilities and Percents |
## Closed Captioned Video: Percents: Probabilities and PercentsVideo Tutorial: Percents: Probabilities and Percents. In this video, percent calculations are used to explore probabilities of events. From a percent-based probability predictions are made for given outcomes. |
Percents | |

## Closed Captioned Video: Percents: Simple Interest |
## Closed Captioned Video: Percents: Simple InterestVideo Tutorial: Percents: Simple Interest. In this video, we look at simple interest in the context of using percent to make calculations. A formula for calculating simple interest is shown and used to solve several real-world problems. |
Percents | |

## Closed Captioned Video: Ratios: Application of Ratios: Roofs and Ramps |
## Closed Captioned Video: Ratios: Application of Ratios: Roofs and Ramps |
Ratios and Rates | |

## INSTRUCTIONAL RESOURCE: Math Examples 54 |
## INSTRUCTIONAL RESOURCE: Math Examples--Subtracting FractionsThis set of tutorials provides 11 examples of how to subtract fractions. |
Add and Subtract Fractions | |

## INSTRUCTIONAL RESOURCE: Math Examples 61 |
## MATH EXAMPLES--Adding FractionsThis set of tutorials provides 11 examples of how to add fractions. NOTE: The download is a PPT file. |
Add and Subtract Fractions | |

## INSTRUCTIONAL RESOURCE: Pumpkin PI |
In this Slide Show, do a hands-on geometry activity to measure π. Note: The download is a PPT file. |
Ratios and Rates | |

## Interactive Math Game | DragNDrop 32 |
## Interactive Math Game--DragNDrop Math--The Point-Slope FormIn this drag-and-drop game, match the linear equation in point-slope form with its slope-intercept counterpart. This game generates thousands of different equation combinations, offering an ideal opportunity for skill review in a game format. |
Point-Slope Form | |

## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 1 |
## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 1This is part of a collection of math quizzes on the topic of solving proportions. Some quizzes are interactive and some are in PDF format. |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 2 |
## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 2This is part of a collection of math quizzes on the topic of solving proportions. Some quizzes are interactive and some are in PDF format. |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 3 |
## Interactive Quiz: Solving Proportions for a, Quiz 01, Level 3This is part of a collection of math quizzes on the topic of solving proportions. Some quizzes are interactive and some are in PDF format. |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 1 |
## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 1 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 2 |
## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 2 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 3 |
## Interactive Quiz: Solving Proportions for a, Quiz 02, Level 3 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 1 |
## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 1 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 2 |
## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 2 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 3 |
## Interactive Quiz: Solving Proportions for a, Quiz 03, Level 3 |
Proportions | |

## Interactive Quiz: Solving Proportions for a, Quiz 04, Level 1 |
## Interactive Quiz: Solving Proportions for a, Quiz 04, Level 1 |
Proportions |