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Technology 
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Cryptarithms

Operations with numbers (Math 4)+ 
JavaScript 
Tool 

[2]

Cryptarithms are brain teasers obtained when digits in numerical calculations have been replaced by letters.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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Decimal Numbers

Writing decimals (Math 4)+ 
JavaScript 
Tool 

[0]

The user learns about decimal numbers, the decimal point, place values, and how to write decimals. After viewing some examples, users can interactively practice writing the given fractions as decimals...
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Dividing Decimals

Dividing decimals (Math 4) 
JavaScript 
Tool 

[0]

The user reviews the method of how to divide decimal numbers. After viewing examples, users can interactively practice dividing decimal numbers.
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Dynamic Paper

General (Math 4) 
JavaScript 
Tool 

[0]

Need a pentagonal pyramid that's six inches tall? Or a number line that goes from ‑18 to 32 by 5's? Or a set of pattern blocks where all shapes have oneinch sides? You can create all those thin...
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Equivalent Fraction Worksheet

Equivalent fractions (Math 4) 
JavaScript 
Tool 

[0]

Generates a worksheet that can be printed and used with student to emphasize the Identity Property to create equivalent fractions. Note: To generate a "new" worksheet, just refresh the browser ...
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Estimating and Rounding Decima...

Rounding (Math 4)+ 
JavaScript 
Tool 

[1]

The user reviews how to estimate and round off whole and decimal numbers. After viewing examples, users can interactively practice rounding the given numbers to specific place values.
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Factoring Unit Quiz

Number theory (Math 4) 
JavaScript 
Tool 

[1]

The user can test their understanding of basic concepts of factoring, such as the greatest common factor and least common multiple using this online interactive quiz.
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Factors and Multiples

Prime (Math 4)+ 
JavaScript 
Tool 

[3]

The user learns about factors, multiples, prime and composite numbers, and how to find factors and multiples of given numbers. After veiwing examples, users can interactively practice factoring numbe...
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Fraction Calculator

Fractions (Math 4) 
JavaScript 
Tool 

[0]

A fraction calculator that includes written stepbystep guides to adding, subtracting, multiplying and dividing fractions.
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Fraction Definitions

Writing fractions (Math 4)+ 
JavaScript 
Tool 

[0]

The user reviews the rules for converting mixed numbers to fractions. After viewing examples, users can interactively practice converting mixed numbers to an improper fraction and finding its reciproc...
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Fraction Models

Fractions (Math 4) 
JavaScript 
Tool 

[0]

Explore different representations for fractions including improper fractions, mixed numbers, decimals, and percentages. Additionally, there are length, area, region, and set models. Adjust numerators ...
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Fraction Wheel Mathlets

Fractions (Math 4) 
JavaScript 
Tool 

[0]

Three mathlets using fraction wheels to illustrate addition and multiplication of fractions. The mathlets are implemented in Java Script and should run on any up to date web browser. They display the...
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Fraction to Decimal

Fractions (Math 4)+ 
JavaScript 
Tool 

[0]

Javascript which converts a fraction to its decimal equivalent. There is also a link to determine if the decimal terminates or repeats.
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Graph of the US Income Distrib...

Large numbers (Math 4) 
JavaScript 
Tool 

[2]

Interact with a graph displaying family income across the population using a football field as the context. The height of the curve at any point is the height of a stack of $100 bills equaling that in...
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Greatest Common Factor

Greatest common factor (Math 4) 
JavaScript 
Tool 

[0]

The user learns about the greatest common factor and how to find it for two numbers. After viewing examples, users can interactively practice finding the greatest common factor for two numbers.
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How Much Pizza to Order?

Equivalent fractions (Math 4)+ 
JavaScript 
Tool 

[0]

The program raises the problem from a hypothetical party where the guests ask for a specific fraction of pizza. Guests can only choose two types of pizza for each party. The program calls for the tota...
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Input/Output Machines

Equations and functions (Math 4) 
JavaScript 
Tool 

[0]

This is a collection of mathlets that model functions as Input/Output machines. In addition to the concept of input/output machines the concepts modeled include:

Jeff's Utilities: Simple Conve...

Measurement (Math 4) 
JavaScript 
Tool 

[2]

Simple conversion utilities for such measures as lengths, areas, volumes, liquid measures, weights, time, speed, temperature, money, bytes, Roman numerals, and more.
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Kilograms to Pounds

Weight/mass (Math 4) 
JavaScript 
Tool 

[0]

Online conversion tool to convert from the weight unit of kilogram to the weigh unit of pounds.
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Least Common Multiple

Least common multiple (Math 4) 
JavaScript 
Tool 

[0]

The user learns about least common multiples and how to find them. After viewing examples, users can interactively practice finding the least common multiple of two numbers.
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Marble Mania!

Probability (Math 4) 
JavaScript 
Tool 

[1]

This is an interactive activity in which the randomness and probability of marbles being pulled out of a "bag" are calculated automatically and for trials up to 500. In short, students will be able...
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Math Cats Balance

Weight/mass (Math 4) 
JavaScript 
Tool 

[0]

You can choose from a wide range of objects to place on this scale  from electrons to galaxies! Click the arrow next to "thin cat" and scroll up and down the object lists to see all the choices.
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Math Water Table

Capacity/volume (Math 4)+ 
JavaScript 
Tool 

[0]

Math Water Table is an online liquid simulator that
models the flow of water through triangular and
rectangular shapes.
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MathFlash  Speech Recognition...

Addition (Math 4)+ 
JavaScript 
Tool 

[0]

This JavaScriptbased game uses the HTML5 Web Speech API to quiz students on addition, subtraction, multiplication and division facts. Students progress through levels and create a Jackson Pollock ...
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Measure It!

Length/height (Math 4)+ 
JavaScript 
Tool 

[2]

The user is shown a ruler with a red bar above it. The task is to determine the length of the red bar and choose the correct answer from the four choices given. Users can choose the level of difficult...
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