Math

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Do you see what they are asking? One way to get a sense of what the goal is, is to just use trial and error to start with.

One card isn't a square; it's 10 by 12, and those aren't equal.

Two cards put together will be either be 20 by 12 or 10 by 24. Neither is a square.

If you try a few more, you'll see that what you need is for a multiple of 10 to equal a multiple of 12. Does that suggest any ideas?
 
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