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Topic (Course) 
Technology 
Type 
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Circle 3

Adding decimals (Math 3) 
Java Applet 
Tool 

[2]

Position the numbers inside of the circles and intersections of circles in such a way that the three numbers in each of the circles sums (adds up) to three.
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Clock Arithmetic

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[1]

Students learn about modular arithmetic operations through working with various types of clocks. Parameters: Number of hours on the clock.
Spanish version also available.
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Clock Arithmetic and Cryptogra...

Operations with numbers (Math 3)+ 
Java Applet 
Lesson Plan 

[2]

The following discussions and activities are designed to lead the students to practice their basic arithmetic skills by learning about clock arithmetic (aka modular arithmetic) and cryptography.
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Clock Arithmetic on a 10hour ...

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

On a 10hour clock, there are only 10 numbers in the whole number system. However, every number has lots of different names. For example, the number before 1 is 0, so 10 = 0 on a 10hour clock.
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Clock Arithmetic on a 12hour ...

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

On a 12hour clock, there are only 12 numbers in the whole number system. However, every number has lots of different names. For example, the number before 1 is 0, so 12 = 0 on a 12hour clock.
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Clock Arithmetic on a 2hour c...

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

On a 2hour clock, there are only 2 numbers in the whole number system. However, every number has lots of different names. For example, the number before 1 is 0, so 2 = 0 on a 2hour clock.
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Clock Wise

Time (Math 3) 
Java Applet 
Tool 

[0]

This activity allows the user to input any time through the day and see it displayed on the clock. The user can also choose to have a random time displayed and try to correctly identify it.
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Clocks and Modular Arithmetic ...

Operations with numbers (Math 3)+ 
Java Applet 
Support Material 

[0]

A dialogue between a student and a mentor on the relationship between clocks and modular arithmetic.
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Coin Box

Money/coins (Math 3) 
Java Applet 
Tool 

[0]

Learn how to count, collect, exchange, and make change for coins. The coin tiles help you count as you learn the value of each coin. How many of the games can you master?
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Collecting, Representing, and ...

Measurement (Math 3)+ 
Java Applet 
Tool 

[0]

Students use this spreadsheet applet to collect and organize weather data over time. The surrounding page gives teachers further questions and ideas to use with their students.
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Color Chips  Addition

Addition (Math 3) 
Java Applet 
Tool 

[2]

This virtual manipulative uses plusminus chips to demonstrate adding positive and negative values.
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Color Chips  Subtraction

Subtraction (Math 3) 
Java Applet 
Tool 

[0]

This virtual manipulative uses plusminus chips to demonstrate that subtracting values is the same as adding negative values.
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Color Patterns

Patterns and sequences (Math 3) 
Java Applet 
Tool 

[2]

Arrange colors to complete a pattern.
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Comparison Estimator

Estimation (Math 3) 
Java Applet 
Tool 

[1]

Practice estimation skills by comparing two sets of objects, lengths, or areas. Parameters include: error tolerance.
Spanish version also available.
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Construct a Solid

Recognize shapes in 3D (Math 3) 
Java Applet 
Activity 

[2]

The fourth of five activities for use with the "Exploring Geometric Solids and Their Properties" tool from NCTM.
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Converting Units

Measurement (Math 3) 
Java Applet 
Tool 

[3]

Use a simple system for converting units.
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Cryptography and Ciphers Dialo...

Operations with numbers (Math 3)+ 
Java Applet 
Support Material 

[0]

A dialogue between a student and a mentor on the relationship between cryptography and ciphers.
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Cutting Corners

Geometry in the plane (Math 3) 
Java Applet 
Tool 

[0]

This tool provides an excellent opportunity for users to talk about the names and attributes of shapes they do not regularly meet.
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Diffy

Subtraction (Math 3)+ 
Java Applet 
Tool 

[1]

Solve an interesting puzzle involving the differences of given numbers.
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El cifrado de César

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

Los estudiantes practican aritmética sencilla codificando y decodificando mensajes mediante un cifrado afín.
versión en inglés
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El cifrado de César II

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

Los estudiantes practican aritmética sencilla codificando y decodificando mensajes para determinar la forma de un cifrado afín.
versión en inglés
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El cifrado de César III

Operations with numbers (Math 3)+ 
Java Applet 
Tool 

[0]

Los estudiantes practican sus habilidades matemáticas y de razonamiento mediante la decodificación de mensajes para determinar la forma de un cifrado afín.
versión en inglés
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Elapsed Time

Time (Math 3) 
Java Applet 
Tool 

[0]

Practice finding elapsed time given a starting time and an ending time.
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Electronic Abacus Applet

Operations with numbers (Math 3) 
Java Applet 
Tool 

[0]

This applet explores the use of an abacus model for representing numbers and for performing addition.
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Equivalent Fractions Finder

Equivalent fractions (Math 3) 
Java Applet 
Tool 

[2]

Visually represent equivalent fractions by dividing squares or circles and shading portions equivalent to a given fraction. Also shows the fractional value on a number line after you check to see i...
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