Shodor Education Foundation
Caesar Cipher
Caesar ciphers hide secret missives. A simple interactive lets users encode and decode hidden messages. The cipher method here is the Caesar shift.
Curated OER
Matrix Madness!!
Perform operations to add, subtract, multiply and divide matrices. Then solve problems with vectors using matrices. A three day lesson: Matrix Madness, Mystical Matrices, and Decode the Encode. The last lesson has prizes that the class...
Curated OER
Secret Messages and Matrices
Young scholars use matrices and linear equations to decrypt a secret message. They receive a part of the encoded message to decode by means of inverse matrices. Pupils write critiques about the activity.
Curated OER
Fifty Dollar Word$
In this proving words have an exact value of $50 activity, students use the "Secret Coded Letter Values" to encode each word and use any math operation in any order or combination. Students encode 5 answers.
Curated OER
Fifty Dollar Word$ From Ms. Smiley's Class
In this math code worksheet, 5th graders analyze 6 words that have an exact value of $50 according to the code. Students encode each word using the values in the key and use any of the four basic math operations to show a final value of...
Curated OER
Fifty Dollar Word$
In this math code worksheet, learners analyze 6 words that have an exact value of $50. Students encode each word with numbers from the key and use any of the four math operations to show a value of $50.
Curated OER
Fundamental Algebraic Skills
In this fundamental algebraic skills worksheet, students solve 11 various problems that include various algebraic skills. First, they use the coded wheel to answer 2 questions about a message. Then, students substitute the given numbers...
Curated OER
Clock Arithmetic and Cryptography
Learners investigate modular clock arithmetic and cryptography. They perform basic operations in modular (clock) arithmetic and encode and decode messages using simple shift and affine ciphers.
Curated OER
Clock Arithmetic and Cryptography
Students perform basic operations in modular (clock) arithmetic. Students encode and decode messages using shift and affine ciphers. Students apply their multiplication, division, addition, and subtraction skills.
Curated OER
Math: Number Systems
Pupils examine other number systems, particularly the binary number system. They discover how to convert from decimal to other base systems. Students analyze the advantages and disadvantages of using the coded decimals.
Curated OER
All Systems Go!
Secret codes are so much fun, and a great way to practice nearly any math skill. Let your class become code breakers as they investigate inverse matrices. They use TI-Nspire technology to solve systems of equations which help them crack...
EngageNY
Using Matrix Operations for Encryption
Data encryption is an important security measure for sensitive data stored on computers. Pupils learn how to utilize matrices for creating code. They also get a great review of matrix multiplication, inverse matrices, and the identity...
Curated OER
Problem Solving Model
Use a vocabulary chart to introduce math functions. The class defines a list of mathematical vocabulary terms on a worksheet, as well as completes equations and expressions. They examine word problems and practice transcribing them into...
Balanced Assessment
Genetic Codes
Determine the number of possible genetic codes. Class members are challenged to determine the number of possibilities of a genetic code that is 20 bases long. They continue to explore the average lengths of broken RNA molecules.
Curated OER
Detective Digis and the Computer Caper
Mathematicians participate in an hands-on activity to investigate the binary number system and write messages in binary code and have classmates decipher the messages. A said video on the topic does not seem to be available, but the...
Curated OER
Matrices: A Secret Weapon
Students perform operations with matrices. In this algebra lesson, students use cryptography and cryptanalysis to solve problems. They add, subtract, and multiply matrices.
Curated OER
Multiplication & Division
Helpful for building a multiplication unit that focuses on different strategies. With explanations about repeated addition and subtraction as foundations for multiplication, scaling, summaries of progression, and basic multiplication and...
Illustrative Mathematics
Adding Tenths and Hundredths
Learning to add fractions with different denominators presents a big hurdle for many young mathematicians. Simplify the process for learners with this series of practice problems involving the friendly fractions tenths and hundredths....
Curated OER
Digital Codes
In this Algebra II/Pre-Calculus worksheet, students convert numbers into binary, octal, and hexadecimal code and examine different uses for writing numbers in other bases. The four page worksheet contains twelve multi-part...
Curated OER
SHHH It's a Secret
Students rewrite word problems using expressions and equations. In this algebra activity, students use the correct variable to solve and write equations. They use the TI to graph their solution.
Curated OER
Secret Sharing with Linear Equations
Learners use linear equations to reveal a secret message. They practice writing linear equations from two ordered pairs. Students determine the y-intercept of the line from the equation. They reveal the secret message from the teacher.
Curated OER
Cryptography on the TI-83 Graphing Calculator
Students explore the history of cryptography. They assess function notation and transformation, matrix operations, and the fundamentals of modular arithmetic. Using graphing calculators, students develop their own encryption schemes.
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.
Curated OER
The Rotating Grille
Students experience the geometric method of coding by actual construction and use of a rotating grille. Students use rotations and reflections to code and decode messages. Students explore nomenclature and symmetry.
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