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What two digit number are interchanged to form a new two-digit number?
Any two digit number in which: (a) the units digit is not 0, and (b) the two digits are different will form a new 2-digit number when the digits are interchanged.
A prime number with two identical digits?
The number 11 is prime and has two identical digits.
What are the two purposes of a digit in any number?
Our numbers have a positional notation system; to know how much a given digit is, you have to know where it is in the number, with respect to the decimal point. So every number first tells you an amount, but it also holds a place in that number, so that it helps to position the other digits.
Does reversing the order of the digits of a two digit prime number always result in a prime number?
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
Is a number a multiple of 4 of its last two digits are divisible by 4?
Yes If a numbers last two digits (assuming that it has at least two) is a multiple of 4, the whole number is also a multiple of 4. If the last two digits are 00 (assuming in this case it has at least three digits), the number is also a multiple of 4. For example, 100 and 200 are multiples of 4.
