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About Variation

Ratios (Math 7)+ 
Flash 
Tool 

[0]

This tutorial explains direct variation, indirect variation, and the constant of variation as they describe the relationship between the x and y values in a simple function.
College Cram charges...
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All About Ratios

Ratios (Math 7)+ 
Computer 
Tool 

[2]

The "All About Ratios" activities are designed to introduce ratios in a conceptbuilding way. The activities can be done on computers with Internet access or be printed. The author suggests that pairs...
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All About Ratios: A Learning T...

Ratios (Math 7)+ 
Flash 
Tool 

[2]

The "All About Ratios" activities are designed to introduce ratios in a conceptbuilding way. Activities include both practice exercises and a quiz.
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Ameba

Proportional reasoning (Math 7) 
Flash 
Tool 

[3]

Ameba is designed to help students gain a better understanding of ratios and proportions. Students are asked to eat a given amount of dots in reference to the total number of dots on the board. The to...
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Area of an Equilateral Triangl...

Ratio and proportion (Math 7) 
TI73 Explorer 
Activity 

[0]

Stepbystep directions on how to use the GeoBoard App to construct objects of various sizes on circular or square boards.
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Balance Applet

Ratio and proportion (Math 7) 
Java Applet 
Tool 

[0]

The weight of one of three shapes is shown in a box below that shape. Try to figure out the weight of the other two objects by using the balance.
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Balance Applet Teacher Introdu...

Ratio and proportion (Math 7) 

Lesson Plan 

[0]

The Balance Applet is a game. There is a balance and 3 different shapes. The weight of one shape is given. The player is asked to find the other shapes' weights using the balance.
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Cabri Jr. Sample Activities

Ratio and proportion (Math 7) 
Cabri Jr. 
Activity 

[0]

The intent of each activity in this brief book is to allow students to use the TI83 Plus and TI84 Plus families of graphing calculators to explore and make conjectures related to key geometry concep...
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Changing Cost per Minute

Rates (Math 7) 
Java Applet 
Tool 

[3]

Users learn how modifications in the rate affect the linear graph displaying accumulation (the total cost of calls).
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Compare Prices During the Grea...

Making comparisons (Math 7)+ 
JavaScript 
Support Material 

[0]

How much did toys and clothing cost during the Great Depression of the 1930s? What would they cost today?
Look at the Then and Now: Prices table below. In the left column is a list of women's clot...
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Comparing Measures with the Pr...

Making comparisons (Math 7)+ 
Java Applet 
Activity 

[0]

In these activities, you’ll predict and compare various dimensions of objects on a theatre stage, using the Proportioner tool.
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Connection Speed

Ratio and proportion (Math 7)+ 
Excel 
Tool 

[0]

Students test the speed of their Internet connection and then estimate the time required to upload and download files of various sizes.
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Constant Cost per Minute

Rates (Math 7) 
Java Applet 
Tool 

[0]

Users examine and try to understand the relationship between a constant rate and how it affects the cost over time.
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Consumer Price Index (CPI) Inf...

Rates (Math 7)+ 
Java Applet 
Tool 

[0]

This is an inflation calculator for adjusting costs from one year to another using the Consumer Price Index (CPI) inflation index. This inflation calculator is based on the average inflation index dur...
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Consumer Price Index (Estimate...

Making comparisons (Math 7)+ 
JavaScript 
Support Material 

[0]

This page has data on the Consumer Price Index (CPI) is a measure of the average change in prices over time in a market basket of goods and services. The Bureau of Labor Statistics releases CPI data m...
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Consumer Price Index, 1913

Making comparisons (Math 7)+ 
JavaScript 
Support Material 

[0]

The Consumer Price Index (CPI) is a measure of the average change in prices over time in a market basket of goods and services. The Bureau of Labor Statistics releases CPI data monthly. This table pro...
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Corredores

Ratio and proportion (Math 7) 
Java Applet 
Technology PoW 

[0]

Di cómo el tamaño del paso de un corredor puede ayudarte a predecir el tiempo que debería hacer el o ella para recorrer una distancia determinada.
versión en inglés
NOTE: A f...
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Direct Variation (Amsco Integr...

Making comparisons (Math 7)+ 
Flash 
Support Material 

[0]

This minilesson explains direct variation: a relationship between two variables such that their ratio is always constant.
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Distance, Rate, and Time

Rates (Math 7)+ 
JavaScript 
Tool 

[0]

The user learns about rates and how to use formulas for solving word problems. After viewing examples, users can interactively practice problems using proportions or the distance formula to find the m...
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Exploring Distance, Rate, and ...

Rates (Math 7) 
Java Applet 
Activity 

[1]

This lesson involves the Runners' applet from the NCTM website. The applet uses two runners, and allows for a variety of parameters. Changing the parameters on the applet helps students develop an und...
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Exploring Distance, Rate, and ...

Rates (Math 7) 
Java Applet 
Activity 

[0]

This worksheet follows up on the classwork activity. Although the homework can be done without having access to the web, it is more beneficial for students to use the applet to check their answers.
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FibonacciLike Sequences and t...

Ratios (Math 7) 
Excel 
Lesson Plan 

[0]

In this activity, students develop the Fibonacci sequence and use a spreadsheet to investigate several of its interesting properties, drawing on a recursive formula to discuss arithmetic and geometric...
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Fish Farm I

Ratios (Math 7) 
Java Applet 
Tool 

[1]

Students try to place male and female fish in different ponds such as to satisfy certain restrictions on the ratios of male to female fish.
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Fish Farm Problem

Ratios (Math 7) 
Java Applet 
Activity 

[1]

Depending on the student's approach to this problem, many types of math can be incorporated to solve this problem. The concept of ratio is used throughout, and students can solve the problem by experi...
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Fish Farm Teacher Support

Ratios (Math 7) 
Java Applet 
Lesson Plan 

[0]

Links to Standards, activities, lessons, other resources.
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