When a number is a multiple of 6, what are the possible values for the ones digit

All possible values are - 6, 2, 8, 4, and 0.  To figure this out simply start with the given number (6) and multiply until the cycle begins to repeat. For example, 6 * 1 = 6, 6 * 2 = 12, 6 * 3 = 18, 6*4 = 24, 6 * 5 = 30, 6 * 6 = 36  

Umm u may get like -6

The answer is a hope i