They only end in zero, the simplist of people could have figured this out, but I will explain anyway. It is because every time 10 gets multiplied, id is moved on to the next set of 10 example: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
Saturn's rotational period is the Saturnian "day." As Saturn is a gas giant, the visible features on Saturn rotate at different rates depending on latitude; the Equatorial Zone has a period of 10 h 14 min 00 s. All other Saturnian latitudes have been assigned a rotation period of 10 h 39 min 24 s.The precise value for the rotation period of the interior remains elusive but the best estimate is approximately 10 h 45 m 45 s (± 36 s).The revolution period of Saturn refers to the orbital period around the Sun (the Saturn "year"), which is about 10,579 Earth days or 29.5 Earth years.(see related link)