Half
noun
You have half a part. Half a part is still half, right?
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.
半分になる
to be halved, to be split in half
半分にする
to halve something, to split something into halves
半分に切る
to cut into halves
半分ちかく
close to half
半分こ
sharing equally
半分づつ
half each
人生の半分
half of one's life
人口の半分
half the population
のこりの半分
the half that's left
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.