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Abacus v1.4	Place value (Math 3)	Java Applet	Tool	[1]
The Abacus Java Applet/Application is an implementation of an Abacus counting machine. The machine displays a total for the number represented by the machine's current state in addition to each digits... More: lessons, discussions, ratings, reviews,...
Aritmética del reloj	Number sense (Math 3)	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 More: lessons, discussions, ratings, reviews,...
Base 10 Blocks: Description an...	Place value (Math 3)	Java Applet	Lesson Plan	[2]
Description and lesson plan for the Base 10 Blocks tool, which allows students to interact with virtual base-ten blocks to work with concepts in the basic operations. Also covers applications of the t... More: lessons, discussions, ratings, reviews,...
Base 10 Blocks: Exploring Othe...	Place value (Math 3)	Java Applet	Tool	[1]
Virtual base-ten blocks (that can be stuck together or broken apart into smaller units, rotated, moved around, etc.) and ideas on using them for addition, subtraction, multiplication, several algorith... More: lessons, discussions, ratings, reviews,...
Base Blocks	Place value (Math 3)	Java Applet	Tool	[7]
Illustrate addition and subtraction in a variety of bases. More: lessons, discussions, ratings, reviews,...
Base Blocks Decimals	Place value (Math 3)	Java Applet	Tool	[1]
Add and subtract decimal values using base blocks. More: lessons, discussions, ratings, reviews,...
Caesar Cipher	Number sense (Math 3)	Java Applet	Tool	[0]
Students practice simple arithmetic skills by encoding and decoding messages using an affine cipher. Spanish version also available. More: lessons, discussions, ratings, reviews,...
Caesar Cipher II	Number sense (Math 3)	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. More: lessons, discussions, ratings, reviews,...
Caesar Cipher III	Number sense (Math 3)	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. More: lessons, discussions, ratings, reviews,...
Chip Abacus	Place value (Math 3)	Java Applet	Tool	[0]
Learn about carrying and digits using chips. More: lessons, discussions, ratings, reviews,...
Clock Arithmetic	Number sense (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. More: lessons, discussions, ratings, reviews,...
Clock Arithmetic and Cryptogra...	Number sense (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. More: lessons, discussions, ratings, reviews,...
Clock Arithmetic on a 10-hour ...	Number sense (Math 3)	Java Applet	Tool	[0]
On a 10-hour 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 10-hour clock. More: lessons, discussions, ratings, reviews,...
Clock Arithmetic on a 12-hour ...	Number sense (Math 3)	Java Applet	Tool	[0]
On a 12-hour 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 12-hour clock. More: lessons, discussions, ratings, reviews,...
Clock Arithmetic on a 2-hour c...	Number sense (Math 3)	Java Applet	Tool	[0]
On a 2-hour 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 2-hour clock. More: lessons, discussions, ratings, reviews,...
Clocks and Modular Arithmetic ...	Number sense (Math 3)	Java Applet	Support Material	[0]
A dialogue between a student and a mentor on the relationship between clocks and modular arithmetic. More: lessons, discussions, ratings, reviews,...
Compare Numbers	Number sense (Math 3)	Flash	Tool	[0]
Compare number size and place the greater or less than sign in the correct place. Use your choice of three levels of numbers to 100, 1000, or to 10000. More: lessons, discussions, ratings, reviews,...
Cryptarithms	Place value (Math 3)	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... More: lessons, discussions, ratings, reviews,...
Cryptography and Ciphers Dialo...	Number sense (Math 3)	Java Applet	Support Material	[0]
A dialogue between a student and a mentor on the relationship between cryptography and ciphers. More: lessons, discussions, ratings, reviews,...
El cifrado de César	Number sense (Math 3)	Java Applet	Tool	[0]
Los estudiantes practican aritmética sencilla codificando y decodificando mensajes mediante un cifrado afín. versión en inglés More: lessons, discussions, ratings, reviews,...
El cifrado de César II	Number sense (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 More: lessons, discussions, ratings, reviews,...
El cifrado de César III	Number sense (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 More: lessons, discussions, ratings, reviews,...
Integer Bars	Place value (Math 3)	Java Applet	Tool	[0]
Integer bars are similar to "Cuisenaire Rods." This applet offers various ways of manipulating virtual integer bars on screen. Its associated lesson contains material to introduce many basic mathemati... More: lessons, discussions, ratings, reviews,...
Manny's Rumba	Number sense (Math 3)	Shockwave	Tool	[1]
Given a target number in the form of an equation "Make x = (number) blocks," move the base ten blocks (ones or tens) to the area showing the target number. More: lessons, discussions, ratings, reviews,...
Modular Arithmetic Lesson	Number sense (Math 3)	Java Applet	Activity	[1]
Clock (or modular) arithmetic is arithmetic you do on a clock instead of a number line. Investigate arithmetic using a 12-hour, 10-hour, and 2-hour clock. More: lessons, discussions, ratings, reviews,...
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