Whenever we multiply a number by five, the resulting product will always end in a zero or five. Five was seen as the number of the human being because we have four limbs and a head that controls it. Glenn Burke is seen by many to be the inventor of the High Five. He was baseball player for the Los Angeles Dodgers. When he hit a homerun, he spontaneously High Fived his teammate and it was captured on television. This was caught on camera on a National broadcast.
It is time to work on the products when five is the multiplier. Make sure to pay attention to the value that is found at ones place.