The secret world of codes and code breaking age 7 to 16 article by nrich team the maths comes if you think of the letters as numbers from 0 to 25 with a being 0 b being 1 c being 2 etc then encoding shifting the alphabet forward three places is the same as adding three to your starting number . This simple resource gives children the opportunity to become code breakers and to make up a code of their own it can easily be linked to a creative writing lesson about spies who use secret codes. Search search 350k teacher reviewed resources including lesson plans worksheets apps learners use the secret code box to decode a number puzzle and make a short e word the secret code 1st 3rd students complete pre reading writing post reading activities for the book the secret code in this guided reading lesson plan students . A grid secret code is easy to set up and is great practice for using coordinates too each letter is represented by a row letter a e and a column number 1 5 two letters have to share a space i chose i and j since they would not be easily confused in a word. Secret codes activity grades 6 8 goal learn about the role computers have played to help save the world duration of lesson 40 minutes to 1 hour objectives learn about alan turing learn about how computers were used in world war ii why their invention was so critical
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