The hundredth item in a series is the one that you count as number one hundred.
The bank celebrates its hundredth anniversary in December.
这家银行在12月庆祝其百年华诞。
hundredths
A hundredth of something is one of a hundred equal parts of it.
Mitchell beat Lewis by three-hundredths of a second.
米切尔以0.03秒的优势打败了刘易斯。