from the opposite of greatest 2digit no. subtract the greatest 1 digit

is not like that
opposite of greatest 2digit is
shouldbe smallest 
10-9 =1
 

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The greatest 2 digit number is 99.Reverse it and it will still remain the same.
Then subtract the greatest one digit number,which is 9,from 99.
So 99-9=90
  • 0
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