To find that, simply take your largest 8-digit number:
99999999
And subtract your largest 7-digit number:
9999999
That leaves you with
90000000, or ninety-million.
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8
20Each of the numbers 8, 18, ... 98 has an 8 in the units digit. That's 10 8's.Each of the numbers 80, 81, ... 89 has an 8 in the tens digit. That's 10 more 8's.(You could do this yourself just by writing down all the numbers.)
57
-5
720 (10*9*8)