It is a number with two digits in it. So it goes into the "tens" place of the numbers.
Basically any whole number from 10 to 99. See how any number between those numbers only has 2 numbers, or digits that make up the number? 9 would only be a single-digit number, and 100 would be a triple-digit number.
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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.
There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.
10
It is 97. it is largest, because it is the largest double digit prime number.
97