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Tool: Clock Arithmetic
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Go to: http://www.shodor.org/interactivate/activities/ClockArithmetic/ (opens a new window)
Description:

Students learn about modular arithmetic operations through working with various types of clocks. Parameters: Number of hours on the clock.

Spanish version also available.

Technology Type: Java Applet 
Author: Shodor: Project Interactivate
Language: English 
Cost: Does not require payment for use

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Lesson Plan: Clock Arithmetic and Cryptography
Support Materials: Cryptography and Ciphers Dialogue
Clocks and Modular Arithmetic Dialogue
Tools: Stopwatch
Arithmetic Quiz
Caesar Cipher II
Aritmética del reloj
Caesar Cipher III
Caesar Cipher
Courses: Math 3 Operations with numbers, Number sense
Math 4 Operations with numbers, Number sense
Math 5 Operations with numbers, Number sense
Math 6 Operations with numbers, Number sense
Math 7 Operations with numbers, Number sense

Teacher Review (Not based on classroom experience)
Reviewer: Ewee, Jun 9 2008 04:10:44:597PM
Appropriate for: practice of skills and understandings
Ability to meet my goals: Effective
Recommended for: Math 6: Number sense
Read the full length reviews for this resource