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The greatest number that can be formed using the digits 9, 0, 0, 0, and 0 is 99,000. The least number that can be formed using these digits is 9,000.
It is 543210. A decimal number need not be fractional.
999,999,999,990
0
You will get the greatest product if you choose the greatest possible numbers in both cases, i.e., 9 x 99.