What are all the factor pairs for 55?

Answer 1

If you include fractions and decimals, then there are an
infinite number of such pairs, so they can't be listed.

If you're satisfied to limit the discussion to whole numbers,
then the pairs are:

1 x 55
5 x 11
-1 x -55
-5 x 11

Answer 2

Al the factor pairs of the number 55 are 1 5 and 11

Answer 3

1 x 55, 5 x 11, 11 x 5, 55 x 1