IPA: /ˈhʌndrɪθ/
KK: /hʌn drɪdθ/
A part of something that is divided into one hundred equal pieces, or the position of being number 100 in a sequence.
She finished in the hundredth place in the race.
Hundredth is formed from "hundred" (from Old English "hundred", meaning a group of one hundred) and "-th" (a suffix used to form ordinal numbers). The word "hundredth" refers to the ordinal position of one in a sequence of one hundred.
Think of a group of one hundred ('hundred') and how the '-th' suffix indicates its position in a sequence, helping you remember that 'hundredth' means the first in a sequence of one hundred.