-89
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well all those #'s have 2 digits and there is 90 numbers so it would be 90 times 2 which equals 180
90. all the numbers from 10 through 99
If you mean, "What is the largest number of digits possible in the product of two 2-digit numbers" then 99 * 99 = 9801, or 4 digits. Anything down to 59 * 17 = 1003 will have 4 digits.
-99
From 1 to 99, there are 99 numbers.The first nine of them ... 1 through 9 ... have only one digit, so discard them.So there are (99 - 9) = 90 positive whole numbers with 2 digits.And another 90 negative whole numbers with 2 digits.
501