For the Teachers
$1 Math
Captivate your class by having them find the value of their names, different zoo animals, musical instruments, etc.,with a mental math lesson. Using the coding formula listed, children learn to fluently estimate and calculate simple sums.
Curated OER
Secret Messages and Matrices
Students 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.
Doing Maths
Converting Metric Measurements Code-Breaker
Can your scholars crack the code of this metric activity? To start, mathematicians must convert different units of measurement to the standard metric system form. Then, pupils plug in the corresponding letter to the correct answer to...
Curated OER
Secret Code Spotlight
In this secret math code worksheet, students solve 14 equations and apply the color value for each line according to the key. Students write the final total and the secret coded letter from another key. Students read the message.
Curated OER
Secret Message
In this division instructional activity, students solve 8 basic division facts. Students then match their answers to the letter key and that will reveal a secret message.
Curated OER
Secret Message - Division
In this secret message division worksheet, 3rd graders find the quotients in 6 division problems. They divide either one or two digit numbers by one digit numbers. They use the quotients to determine the letters that are placed on the...
Curated OER
Flow Chart Secret Code: What Should You Call A Cow That Lives in Alaska?
In this math code instructional activity, students solve 10 multi-step problems using all math operations. Students start with the given number and perform each step in a flow chart format. Students take their total answer and decode the...
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
Secret Message: Missing Factors
In this missing factor activity, students find missing factors in equations, then use a set of corresponding letters to find the "secret password." Answers are included on page 2.
CK-12 Foundation
Solving Equations Using the Pythagorean Theorem: Cryptography
Don't keep this resource a secret. Individuals learn to use the Pythagorean Theorem to find Pythagorean triples. They also see how Pythagorean triples can be useful in the field of cryptography to encrypt secret messages.
Curated OER
Secret Sharing with Linear Equations
High schoolers 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...
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
Secret Code
In this multiplication puzzle instructional activity, students find the products to 18 elementary multiplication problems. They solve the code using the letters assigned to each product. They read the secret message.
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
Squigly's Secret Easter Code
In this math worksheet, students practice solving the code in order to decipher a secret message that is based upon the theme of Easter.
Curated OER
Holiday Math Mystery
In this Christmas math activity, students fill in each tree with the missing number to complete the addition problems. Students then use the missing numbers to find the secret message about Christmas.
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...
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...
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.
Curated OER
Holiday Math Mystery
In this holiday math mystery worksheet, students fill in fifteen missing numbers that makes each tree correct. Students then use the missing numbers in each tree to find the secret message shown.
Houghton Mifflin Harcourt
Challenge: Code Breaker
Here is a code-breaker multiplication and division game which has learners find the missing letter in equations, then solve and use those letters to "break the code," which actually is the answer to a riddle. Make math fun with a...
Curated OER
Secret Code Message 2
In this letter and number recognition worksheet, students use a secret code box to help them spell 4 short Ee words. Students then draw pictures of the words.
Curated OER
Basketball Addition Puzzle
In this math worksheet, students solve 25 basic addition facts below 20. Using the sums and the key to the code, students decipher a secret message about basketball.
Curated OER
Baseball Word Puzzle and Addition Facts
In this math worksheet, students solve 25 basic addition facts below 20. Using the sums and the key to the code, students decipher a secret message about baseball.