There is no THE 80 digit number - there are 9*1079 of them and each one of them has a differen name just as 11 and 12, both 2-digit numbers, have different names.
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When rounding 80 to the nearest whole number, you look at the digit in the ones place, which is 0. Since 0 is less than 5, you round down, making 80 rounded to the nearest whole number 80.
1234567890
close, ten millions place, because that number is 80 million....
Divide the two-digit number by the one-digit number. If the remainder is zero then the 2-digit number is a multiple and if not, it is not.