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Back to School Code Breaker

First-week secret-code activity with A1Z26 (A=1 … Z=26)

A ready-to-print back-to-school code-breaker built around the A1Z26 alphabet code. Students encode familiar classroom words, decode number clues into school objects, and finish by cracking a hidden welcome message — a friendly first-week ice-breaker or early-finisher task that sneaks in some counting and spelling. Print the student PDF and answer key below, or work the puzzles on this page.

Printable PDF — free to download & print

Download Student PDFAnswer Key (PDF)

How to use this worksheet

A back-to-school warm-up using the A1Z26 code, where A=1, B=2 … Z=26. Encode each classroom word into numbers, decode the number clues into words, then crack the welcome message. Great as a first-day ice-breaker or an early-finisher task.

Exercises

  1. 1. Encode the school word: PENCIL
  2. 2. Encode the school word: TEACHER
  3. 3. Encode the school word: RECESS
  4. 4. Encode the school word: LIBRARY
  5. 5. Encode the school word: SCIENCE
  6. 6. Decode the number clue: 2 15 15 11
  7. 7. Decode the number clue: 4 5 19 11
  8. 8. Decode the number clue: 3 12 1 19 19
  9. 9. Decode the welcome message: 23 5 12 3 15 13 5 / 2 1 3 11 / 20 15 / 19 3 8 15 15 12

Full solutions are on the downloadable answer key (PDF).

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