Random Mathematical Expressions

Hi ppls,
I am in a bit of a bind...I need to create random maths expressions such as 1+1=2, and logical expressions such as 3<4. These expressions shall be flying around and the user is to click and drag them in the approprite box (True or false). I have been able to randomly generate the expressions....however, I am really unsure as to how each expression shall know its value (true of false) if it is random, in order to compare it when matched against the correct box. Any assistance would be greatly appreciated.
Cheers

Thanks for that..I'll give it a go....also..I have been told that my random expression generation is more complicated than it really is..would you mind taking a quick glance at it. The thing is I don't want to post it up!

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