what is 1000 lessthan the biggest four digit number

Question

i have no discription

Answer 1

If the 4 digits within the number can be the same, the biggest 4 digit number would be 9,999 since the next number up would be 10,000 (a 5 digit number). So 1,000 subtracted from 9,999 would be 8,999.

9,999 - 1,000 = 8,999