One way of writing a word in a secret code is to write the difference of the values of each letter compared to the next (including negative numbers if the first letter in a pair has a larger value than the second)

For example the word AREA would be 17,-13,-4.

However many other sets of four letters would also have this same three-numbered cipher.

The following cipher could only be one possible nine-letter word. What is it?

-2, -17, 15, -11, 21, -17, 12, -8

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More Mathematics Lesson Starters

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Monday, July 2, 2018

"As an extension activity: Which other words can you find that will create unique ciphers?

For more activities like this see the Code Cracking presentation and related challenges."

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