Curated OER
Scatter Brain
Examine a coordinated geometry grid to decode the hidden message. Pupils write a coded message to their parents using letter coordinates from the grid.
Curated OER
Math Vocabulary Decoding Activity
In this math vocabulary worksheet, students use a letter key code to match match vocabulary words to their definitions. A reference web site it given for additional activities.
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
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...
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.
Shodor Education Foundation
Spy Game
Turn students into detectives as they decipher encrypted messages. Introduce your class to modular arithmetic and have a little fun encrypting and decoding secret messages. The activity does not hit many content standards, but...
Curated OER
Decoding a Mystery Message from Space
Students examine a message sent from outer space and do their best to interpret its meaning. In this problem solving lesson plan, students investigate a code sent to them from "outer space." The students collaborate with their classmates...
Curated OER
Shh... It's a Secret!
Fifth graders examine a series of rules for deciphering a code. They create their own secret message using a code after watching video. They access a web site to practice their decoding skills.
Curated OER
Why You Shouldn't Let a doctor Put One of Those Sticks in Your Mouth
For this integer worksheet, 5th graders use greater than and less than. Students solve 28 problems, decoding the answer to a riddle in the worksheet completion.
Curated OER
Telephone Numbers
In this three-digit identification worksheet, students determine who has each of the telephone numbers listed using the key shown. They also use a standard telephone keypad to decode the phone numbers with the correct letters in the name.
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...
BBC
The Cream Cake Mystery - Seeing Patterns
A great language arts lesson designed for emerging readers awaits your class. Rhyming words are the focus. Learners play an interactive learning game on the computer that helps them to understand words that rhyme. As with all of these...
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
Skip Counting to Music
Your youngest mathematicians skip count by 2's, 5's, and 10's as they sing along to a Hap Palmer song that helps them remember the patterns. Students practice in whole group and then individually with the worksheet provided, using the...
Curated OER
Codebreaker Math
Students solve addition and subtraction problems and decipher and write messages using a code. They read and discuss an informational fact sheet about the Navajo code talkers from World War II, and decode and re-code messages using math...
Curated OER
Morning Message-Mystery Code
Students copy and figure out the Mystery Codeword each day. They copy Mystery Code into journal. They match the number with the letter to decipher the code word. They draw a picture to match code word. At the end of the week, the...
Curated OER
Linear Equations
In this algebra activity, students solve linear equations through graphing and the use of formulas. There are 34 questions ranging from addition and subtraction of linear equations to graphing and substitution.
Curated OER
Cryptography Implementation
Learners explore cryptology. They write a research paper on cryptography. Using linear equations, students invent a code and write a secret message. Learners complete cryptography puzzles.
Curated OER
Number Recognition Games
Students explore number sense by participating in a math recognition activity. In this number identification lesson, students practice pronouncing names of numbers and matching the number with an amount of objects. Students practice...
Curated OER
Shape Recognition Games
Students explore shapes. In this math lesson, students identify basic geometric shapes. Students complete activities in which they identify shapes, symbols and letters. Students draw geometric shapes.
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
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.
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