Curated OER
Unit Fractions of Numbers
In this unit/fractions worksheet, students find unit fractions of given numbers, then use a code grid to find a secret code word.
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Professor Panda's Pizza Graph
In this data analysis worksheet, students answer 11 questions using a bar graph that was constructed from the answers to a survey about pizza toppings. They use a secret code to determine the best place to have a pizza.
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 would be...
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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...
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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.
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Secret Code
In this division worksheet, 4th graders solve the 11 division equations and then match each number in the message with the division quotients. Students determine the message.
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Fourth of July Add or Subtract Worksheets
There are actually two Independence-Day-themed worksheets in this resource. Patriots solve three-digit addition and subtraction problems, then find the letter from the key that corresponds to each of their answers. As they place each...
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Basketball Addition Puzzle
In this math activity, students solve 25 basic addition facts below 20. Using the sums and the key to the code, students decipher a secret message about basketball.
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Baseball Word Puzzle and Addition Facts
In this math activity, students solve 25 basic addition facts below 20. Using the sums and the key to the code, students decipher a secret message about baseball.
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George Washington Addition Puzzle
In this math instructional activity, students solve 45 basic addition facts. Using the sums and the key to the code, students will decipher the secret message about George Washington.
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SHHH It's a Secret
Students rewrite word problems using expressions and equations. In this algebra lesson, students use the correct variable to solve and write equations. They use the TI to graph their solution.
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The Rotating Grille
Learners 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. Learners explore nomenclature and symmetry.
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Caesar Ciphers: An Introduction to Cryptography
Students brainstorm and discuss the concept of cryptography, the science of secrets in today's world and then focus on a system for sending secret messages used by Julius Caesar. They make a Caesar wheel assessing encrypting and...
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Caesar Ciphers: An Introduction to Cryptography
Students encode and decode messages using a Caesar Cipher. In this encoding and decoding messages using a Caesar Cipher lesson, students discuss cryptography and how it is used. Students make a Caesar wheel to encode and decode...
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Signal Corps
Young scholars examine the role of signal corps during the Civil War and explore the technique of 'wigwag.' In this Civil War instructional activity, students discuss the way they communicate long distance today, they research how a...
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Decoding Machine
Pupils 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...
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Cracking the Code
Second graders explore patterns with colors, shapes, and numbers by completing a fun quiz, watching a video, creating their own secret patterns/codes and completing an online patterning game.
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Addition Facts (Chinese New Year Puzzle)
In this math worksheet, students solve 15 basic addition facts with sums up to 20. Using the answers and the code key, students decipher the secret message about Chinese New Year.
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Minnesota Muskrat's Worldwide Adventures
In this long division worksheet, 5th graders solve problems to decode a secret message. Students solve for 60 problems with some remainders and two digit quotients.
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Basic Crypto Systems
Students try to solve codes mathematically. The use of a code needs a key. Students try to decipher a code with a mathematical key. This requires focus and higher order thinking skills like analysis.
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Cryptography Implementation
Students explore cryptology. They write a research paper on cryptography. Using linear equations, students invent a code and write a secret message. Students complete cryptography puzzles.
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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."
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U Boat Hunt
Students recognize patterns and sequences in numbers. In this geometry lesson, students create rules to define the sequences and patterns they obsere. They translate coded messages as they dicuss navigational terms.
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Roman Numerals and Their History
Students identify Roman numerals and the history associated with them. In this historical number lesson, students investigate charts and photographs to discover the history of Roman numerals. Students bring a Roman numeral into class...