Precisely what it says in the title.
Construct two numbers using figures 4,5 and 6 whose product is as big as possible.
I don't know whether I can use a same number again (4456, f.e.) or only 4,5 and 6 (I'm guessing it's this one).
I could go about it with trial and error, but would like to know the reasoning behind it.
PS: I thought about 654 * 645 because the bigger the number in the place of the hundreds, the bigger the result.
Answer
There are only 6 choices, namely
6×54=324
6×45=270
5×64=320
5×46=230
4×56=224
4×65=260
Thus the maximum is 6×54=324
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