Written for teachers, this article discusses mathematical representations and takes, in the second part of the article, examples of reception children's own representations.
Substitution and Transposition all in one! How fiendish can these codes get?
Letters have different values in Scrabble - how are they decided upon? And would the values be the same for other languages?
Find the frequency distribution for ordinary English, and use it to help you crack the code.
Here is the start of a six-part challenge. Can you get to the end and crack the final message?
Class 5 were looking at the first letter of each of their names. They created different charts to show this information. Can you work out which member of the class was away on that day?