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Is the sum of two eight digit numbers a nine digit number?

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In our decimal system the addition of any number, where each digit it turn is replaced with the nines complement, will result in an all nines answer. The addition of any number higher will result in an additional digit. For example, start with 1234 then add 8765 and you have 9999. read more

By adding two eight digit numbers with n=1 you get a 16 digit number. By adding two eight digit numbers with n=2 you get a 9 digit number. But by adding two eight digit numbers with n>2 you get an 8 digit number if the average of both numbers is smaller than (n/2)*n^8; otherwise it’s a 9 digit number. read more

expressing numbers in words and viceversa Find a three-digit number that satisfy following question. read more

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Example 13 - The sum of a two-digit number and number ...
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Further Research

Digit Sum Arithmetic
www.sjsu.edu

Nine Digit Number
jwilson.coe.uga.edu

Numbers with Digits
www.math-only-math.com