Curated OER
Clock Arithmetic and Cryptography
Students explore the concept of modular arithmetic and cryptography. In this modular arithmetic and cryptography lesson, students use applets to explore modular arithmetic using a clock and Caesar Ciphers. Students exchange their ciphers...
Curated OER
Modular Arithmetic
Learners investigate modular arithmetic and how to use it to solve real world problems. In this modular arithmetic lesson, students use computers to work on modular arithmetic after a teacher guided lesson. They complete guided practice...
Curated OER
Applications of Modular Arithmetic
In this modular arithmetic learning exercise, students use modular ten arithmetic to create Universal Product Code. This two-page learning exercise contains seven problems.
Shodor Education Foundation
Shodor Interactivate: Clock Arithmetic
Students will explore modular arithmetic in this activity. The student will set a starting value and them move the "clock" forward a number of specified hours to see the resulting sum. Included are disucssion resources, additional...
Maths Challenge
Maths challenge.net: Remainder of One
A critical thinking problem that may be solved with modular arithmetic knowledge or long had divisions. A great problem solving exercise.
Shodor Education Foundation
Shodor Interactivate: Caesar Cipher
Create your own affine cipher for encoding and decoding messages. Input your own constant and multiplier, then input a message to encode.
Khan Academy
Khan Academy: Congruence Relation
A quick comprehension check over congruence relation.
Shodor Education Foundation
Shodor Interactivate: Spy Game
Students will learn about modular arithmetic in order to decipher encrypted messages.