particle N2 common casualpolitewritten

〜分 — the portion/amount of ~

〜分・ぶん

Meaning

the portion / share / amount of ~ — the quantity that corresponds to a stated thing; その分 'that much / correspondingly'

食たべた分ぶんだけお金かねを払はらう。

You pay only for the portion you ate.

Attaches to	Form	Example
Noun, or plain verb/adjective clause	N + 分 / V(plain) + 分	三人分さんにんぶん / 働はたらいた分ぶん

二人分ふたりぶんの料理りょうりを注文ちゅうもんした。

I ordered food for two people.

急いそいだ分ぶん、早はやく着ついた。

We arrived early, in proportion to how much we hurried.

休やすんだ分ぶんは後あとで取とり戻もどす。

I'll make up later for the amount I rested.

その分 works as a set connector meaning 'and correspondingly / to make up for it': 給料きゅうりょうは安やすいが、その分ぶん楽らくだ ('the pay is low, but the work is easy to match').

Jengo shows 〜分 the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled with reference to A Dictionary of Intermediate Japanese Grammar. Editorial confidence: medium.