Curated OER
Shh...It's a Secret!
Students explore codes, decode secret messages, and create codes of their own to use with their friends. They examine the use of gestures, letters, symbols and numbers in codes.
Curated OER
Decoding Nazi Secrets
Students practice decoding messages given the key. They continue to practice solving messages without a key. They must determine the best way to view the message. They examine secret messages during World War II.
Curated OER
SHHH It's a Secret
Students rewrite word problems using expressions and equations. In this algebra instructional activity, students use the correct variable to solve and write equations. They use the TI to graph their solution.
Curated OER
Algebra: Introduction to Algebraic Expressions
Seventh graders, in an introductory algebra class, code and decode messages using substitution ciphers. Role-playing as mathematicians, they work in groups to decipher several messages, one of which translates to "math is awesome."
Curated OER
Coded Messages
High schoolers solve matrices by multiplication. In this algebra lesson, students create coded messages and relate it to solving matrices. They multiply and find the inverse of matrices.
Computer Science Unplugged
Count the Dots – Binary Numbers
Did you know you can send a message using only zeroes and ones? This interactive resource presents an introduction to binary numbers. Through code cards, pupils learn to convert binary numbers to decimal numbers.
Curated OER
Clock Arithmetic and Cryptography
Learners perform basic operations in modular (clock) arithmetic. Students encode and decode messages using shift and affine ciphers. Learners apply their multiplication, division, addition, and subtraction skills.
Curated OER
Decoding Machine
Students are introduced to the concept of variables and their uses. In groups, they are given a code in which they must find the value of the missing words. To end the lesson, they find the value of words over ten letters long and their...