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Here's a problem I set in a workshop this morning:
I have a piece of string. If I form a rectangle with my string, the biggest area I can make is 64cm². How long is my piece of string?

Of course, a problem is only a problem if you don't immediately know the answer! If you don't know the answer straight away, how might you get started? If you do, what hints might you give to help another person get started? #ITeachMath