Codebreakers in the format popular on TES. These are focused on adding and subtracting lengths given in different units (e.g. mm + cm).
There are three codebreakers attached - each with a (bad) joke. They gradually become more difficult in various ways
Both codebreakers require students to convert units by multiplying/dividing by 10, 100 or 1000. The third is more challenging to decode (the units in the key for the first codebreaker are all in metres, this is not the case for the third).
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