No it would be 2-3 digets depending on the number.
97=largest 2 digit prime
That is correct. Considering the largest double digit whole number is 99. Unless of course, you mean adding the two digits of a double digit number alongside the two digits of another double digit number, then yes, you will have a 4 digit number. Depends how you interpret the question, and your creativity.
The largest 2-digit prime number is 97.
The largest 2 digit composite number is 99.
97 is the largest 2-digit prime number.
The smallest 2 digit whole number is 10 The smallest 2 digit odd whole number is 11
No. When adding the smallest 2 digit number (= 10) to the smallest 2 digit number (again, 10) the result is a 2 digit number (10 + 10 = 20). When adding the largest 2 digit number (= 99) to the largest 2 digit number (again, 99) the result is a 3 digit number (99 + 99 = 198). As you can see, you'll either get a 2 or 3 digit number, but never a 4 digit number.
98,901
9876543
98
97
95
98
88
The answer is 43 and the reason why the tens digit changes is because 7 + anything over 2 will change the digit. If just added 7 + 6 it would be 13 then add 30. 1 + any whole number over 8 will change the tens digit 2 + any whole number over 7 will change the tens digit 3 + any whole number over 6 will change the tens digit 4 + any whole number over 5 will change the tens digit 5 + any whole number over 4 will change the tens digit 6 + any whole number over 3 will change the tens digit 7 + any whole number over 2 will change the tens digit 8 + any whole number over 1 will change the tens digit 9+ any whole number over 0 will change the tens digit ect
89 rounds to 90