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Technology 
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Aritmética del reloj

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Los estudiantes aprenden operaciones de aritmética modular trabajando con diferentes tipos de relojes. Parámetros: Número de horas en el reloj.
versión en inglés
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Base 10 Blocks

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

This program consists of a panel, as shown on the right, where one can click on any of three different block sizes that represent 1 unit, 10 units, and 100 units and drag them into the working pane...
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Base Blocks

Addition (Math 4)+ 
Java Applet 
Tool 

[10]

Illustrate addition and subtraction in a variety of bases.
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Base Blocks Addition

Addition (Math 4) 
Java Applet 
Tool 

[6]

Use base ten blocks to model grouping in addition.
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Base Blocks Subtraction

Subtraction (Math 4) 
Java Applet 
Tool 

[6]

Base blocks consist of individual units, longs (containing 10 units), flats (containing 10 longs), and blocks (containing 10 flats) and can be used to show place value for numbers and to increase unde...
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Caesar Cipher

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Students practice simple arithmetic skills by encoding and decoding messages using an affine cipher.
Spanish version also available.
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Caesar Cipher II

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Students practice simple arithmetic skills by encoding and decoding messages to determine the form for an affine cipher.
Spanish version also available.
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Caesar Cipher III

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Students practice their reasoning and arithmetic skills by decoding messages to determine the form for an affine cipher.
Spanish version also available.
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Car Jump

Comparing and ordering (Math 4) 
Java Applet 
Tool 

[1]

A math gamelet to help students compare sizes of numbers and their relative locations on a number line. Students position a ramp on the correct place on a number line so the jumping car can land safe...
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Circle 0

Addition (Math 4) 
Java Applet 
Tool 

[4]

Position the 14 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 zero.
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Circle 21

Addition (Math 4) 
Java Applet 
Tool 

[1]

A puzzle involving adding positive and negative integers to sum to twenty one.
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Circle 99

Addition (Math 4) 
Java Applet 
Tool 

[0]

A puzzle involving adding positive and negative integers to sum to ninety nine.
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Clock Arithmetic

Operations with numbers (Math 4) 
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 on a 10hour ...

Operations with numbers (Math 4) 
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 4) 
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 4) 
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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Color Chips  Addition

Addition (Math 4) 
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 4) 
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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Comparison Estimator

Estimation (Math 4) 
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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Diffy

Subtraction (Math 4) 
Java Applet 
Tool 

[1]

Solve an interesting puzzle involving the differences of given numbers.
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Egyptian Multiplication

Multiplication (Math 4) 
Java Applet 
Tool 

[0]

The Egyptian Multiplication algorithm. Offers a meaningful way to practice addition, subtraction and doubling of integers. Demonstrates an interplay between the decimal and binary systems.
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El cifrado de César

Operations with numbers (Math 4) 
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 4) 
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 4) 
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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Electronic Abacus Applet

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

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