Cipher Sleuths - National Security Agency - nsa 2026

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The document titled 'Cipher Sleuths' outlines a unit designed for fourth to sixth grade students that focuses on data analysis through the deciphering of secret codes. It includes activities where students analyze letter frequency in texts, graph data, and solve various ciphers while learning related vocabulary. The unit aligns with NCTM 2000 Principles for School Mathematics, emphasizing equity, coherent curriculum, effective teaching, and the use of technology. Students will engage in hands-on activities over three to five days, culminating in a performance assessment through a cipher challenge.

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Begin by reviewing the introduction section, which outlines the objectives of the Cipher Sleuths unit. Familiarize yourself with the activities and expected outcomes.
Move to Activity 1, where you will gather data on letter frequency. Use the provided Letter Frequency Table to record your findings as you analyze a text passage.
In Activity 2, utilize the NCTM data sheet to compare your results. Round each percentage and create a number line plot using the graphing sheet provided.
Proceed to Activities 3 and 4, where you will engage with vocabulary related to codes and practice deciphering ciphers using resources like the Caesar Cipher Chart.
Finally, complete the Super Cipher Solver Challenge by applying your knowledge of transposition and substitution ciphers. Document your findings in the designated sections.

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