Coded Messages
Language Arts/Math Activity
Mysteries sometimes include coded messages. In this activity, students will
create a code, write coded messages and decode each other's messages.
WHAT YOU NEED
WHAT TO DO
 Introduce the idea of coded messages to the students: Write the alphabet
across the chalkboard. Below the letters write the numbers 126, with "1" below
"A," "2" below "B," etc.
 Then write a simple, short sentence on the board and write the number
equivalent of the first word. Invite volunteers to write the number equivalents of
the remaining words.
 Divide the class into groups of three. Challenge each group to devise a code
based on a growing number pattern (e.g., 1, 2, 4, 7, 11 . . .). On a sheet of paper,
have students write the alphabet and the number that will stand for each letter,
just as you did on the board.
 Now have each student write a secret message (a short sentence) and encode
the message on another sheet of paper. Invite students to exchange and decode
one another's messages.
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