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Topic (Course) 
Technology 
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Estimador de comparaciones

Estimation (Math 4) 
Java Applet 
Tool 

[0]

Similar al Estimador pero compara dos conjuntos de objetos.
versión en inglés
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Estimador de mayor o menor

Estimation (Math 4) 
Java Applet 
Tool 

[0]

Similar a la actividad de Estimador pero da una cantidad y pide al usuario que estime si el grupo de objetos es mayor o menor al número dado.
versión en inglés
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Estimator

Estimation (Math 4) 
Java Applet 
Tool 

[0]

Practice estimation skills by determining the number of objects, length, or area. Parameters include: error tolerance.
Spanish version also available.
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Estimator Four

Estimation (Math 4) 
Java Applet 
Tool 

[0]

A game that asks the players to estimate an answer within a given time span. Parameters include: time limit, error tolerance, difficulty level.
Spanish version also available.
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Flash Card applet

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Flash Card applet. Enter the answer, hit "Return".
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Flash Cards

Addition (Math 4)+ 
Java Applet 
Tool 

[1]

This applet produces random math problems and tracks the number of correct answers that are given.
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Lattice Multiplication

Multiplication (Math 4) 
Java Applet 
Tool 

[0]

Graphical demonstration of the lattice multiplication algorithm. The numbers are easily modifiable with the mouse. The tool helps users understand the source of a "carry" and the entailed action.
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Long multiplication

Multiplication (Math 4) 
Java Applet 
Tool 

[0]

A Java applet presents multiplication of two numbers in a standard, long form. Options include displaying and removing trailing zeros and skipping a product by a zero digit. Both numbers are easily mo...
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Magic Square Java Applet

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Slide each number to fill one of the squares so that the sum of the columns and rows equal the same number. Start with a 3 x 3 square and then try a 4 x 4 and a 5 x 5. Originally written in 1996, you ...
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Math Owl

Operations with numbers (Math 4) 
Java Applet 
Tool 

[0]

Animated chalkboard lessons in adding, subtracting, multiplying, or dividing, from single digit addition to regrouping to multidigit multiplication and division. Follow the prompts that break down e...
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Mental Arithmetic Drills

Mental math (Math 4) 
Java Applet 
Tool 

[2]

Mental arithmetic drills in the four operations. Various difficulty levels are available.
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More or Less Estimator

Estimation (Math 4) 
Java Applet 
Tool 

[1]

States a quantity and asks the user to estimate whether the set of objects is more or less than the number given.
Spanish version also available.
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Number Line Arithmetic

Addition (Math 4)+ 
Java Applet 
Tool 

[1]

This virtual manipulative can be used to depict whole number addition, subtraction, multiplication and division operations carried out on a numberline.
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Number Line Bars

Addition (Math 4)+ 
Java Applet 
Tool 

[1]

Use bars to show addition and subtraction on a numberline.
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Number Line Bounce

Addition (Math 4)+ 
Java Applet 
Tool 

[5]

This virtual manipulative can be used to visualize a sequence of operations on a number line and to create number sentences representing the operations.
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Number Puzzles

Operations with numbers (Math 4) 
Java Applet 
Tool 

[1]

Solve puzzles involving arranging numbers on a diagram so that they add up to a given value.
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Rectangle Division

Division (Math 4) 
Java Applet 
Tool 

[1]

Visualize and practice dividing numbers by using an area representation.
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Rectangle Multiplication

Multiplication (Math 4) 
Java Applet 
Tool 

[2]

Visualize the multiplication of two numbers as an area. Choose the latticeoption to draw a correspondence between the lattice method for multiplying numbers and an area representation. Choose t...
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Russian Peasant Multiplication

Multiplication (Math 4) 
Java Applet 
Tool 

[0]

A tool to learn and practice the Russian Peasant Multiplication algorithm. May serve as an introduction into the binary system.
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Soroban in Various Number Syst...

Addition (Math 4)+ 
Java Applet 
Tool 

[0]

An interactive Java gadget simulating sorobanthe Japanese abacus. Options inlude selecting the number system base and the number of wires. The applet displays the number matching the configur...
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Suan Pan in Various Number Sys...

Addition (Math 4)+ 
Java Applet 
Tool 

[0]

An interactive Java gadget simulating suan panthe Chinese abacus. Options include selecting the number system base and the number of wires. The applet displays the number matching the configu...
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The Abacus in Various Number S...

Addition (Math 4)+ 
Java Applet 
Tool 

[0]

An interactive Java applet showing one or two Russian abacuses with options to select the base of the number system and the number of wires. The applet displays the number matching the current config...
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Base 10 Subtraction Mathlets

Operations with numbers (Math 4)+ 
JavaScript 
Tool 

[0]

These mathlets illustrate the standard base 10 subtraction algorithm. They provide randomly generated subtraction problems with up to 4 decimal places and allow the student to step through the solutio...
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Basic Facts Worksheet

Operations with numbers (Math 4) 
JavaScript 
Tool 

[0]

Each instance generates a new 100 problem worksheet of basic math facts. Ideal for timed drills/speed drills. Note: Reload the page and another set of problems will be generated.
There is an...
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Cryptarithms

Operations with numbers (Math 4) 
JavaScript 
Tool 

[1]

Cryptarithms are brain teasers obtained when digits in numerical calculations have been replaced by letters. Customarily, distinct letters stand for different digits. Another term, Alphametics, denote...
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