the product of x9 is always the # being multiplied less than if multipliedby 10.
example
10 x 5= 50
9 x5 = 45 or 5 less than 50
10 x 10 =100
9x10 = 90, or 10 less than 100
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fivty four
9
500
I'm not quite sure if this is what you mean but: 9/9=1 9+1=10 9/9=1 10*1=10 The whole thing: (9/9)*(9+(9/9))=10
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