Negative 9 times 9= Negative 81
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1 and 81 Those two numbers certainly divide into 81 though they are not the only numbers to do so.
81 and 9 if you add them. 4 and 25 if you multiply them.
9 x 9 = 81 :(
36 and 45
1 x 81, 3 x 27, 9 x 9.