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.
Not necessarily. Consider 444. The digits are not different. The first and second digits are not multiples of 3 The first digit is not greater than the second digit. In spite of all that, 444 is a 3-digit number
Six.
Any 5-digit number is greater than a 4-digit one.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
83 A+
19
45
46.
The original number is 58.
45
45
45 and 54
To total 17 the two digits must be 8 and 9! The original number was 98.
98 and 89
the answer is 25 and then if you reverse that it is 52
The number is 36