Half
noun
You have half a part. Half a part is still half, right?
はんぶん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この本を半分までよみました。
I’ve read halfway through this book.
このクラスの半分は女子です。
Half of this class are girls.
ざっくり日本人の半分ぐらいはニンジャです。
About half of the Japanese are ninjas.