As a product of its prime factors: 5 times 11 = 55
5 x 11 = 55
55, 110, 165, 220, 275, 330, 385, and etc. As long as it is a multiple of 55, you could also divide other numbers by 55, but it won't be a whole number.
The concepts "even" and "odd" apply to whole numbers. They don't make sense for other classes of numbers, such as rational numbers, real numbers, complex numbers, etc.
54 + 55 + 56 = 165
5 and 11
54+55+56 is one possibility.
You use the apostrophe, like this: '55
The numbers are: 55 and 55
45 + 55 = 100 45 = ½(9 x 10) 55 = ½(10 x 11)
A common factor is a number that is a factor of both (or all) the numbers in question. Therefore 55 would be a common factor of 110 and 165 because both of these numbers can be divided by 55.However, a number by itself (and not in reference to other numbers) cannot be called a common factor. So 55 could be a common factor, but isn't necessarily always one.
55 and 110
The two prime numbers that are factors of 55 are 11 and 5.