The pupils need to figure out which is the best letter to start with and then calculate all the other letters (using substitution and bidmas). The end code will give the number 353. I like to put some sweets into a money box locked with a 3-digit number lock and the first pair/ group to get the right code gets the sweets. :)
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I am not sure how an 11 year old would go, but my 14 year olds will love it <br /> Leanne
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