Why do JLPT N4 learners confuse 決る with 増える?

Both words occupy adjacent semantic territory, which is exactly why the JLPT uses them as distractors for each other on multiple-choice items. The fastest way to stop confusing them is to study them as a pair, write a one-sentence contrast in your own words, and drill the pair specifically rather than each word in isolation.

Is 決る or 増える more common on JLPT N4?

Both appear in the JLPT N4 curriculum and either may show up on a given exam. Don't try to predict which one the test will choose — learn to distinguish them and you'll be safe regardless. Both belong to the Change & Process theme of N4 vocabulary.

How do I practice this confusion pair?

Free option: visit /try and pick a confusion drill. Paid option: none — JLPT Mastery is free during launch. Whichever route you take, the engine specifically re-tests pairs you've gotten wrong rather than rotating through general vocabulary review.

JLPT N4 · Elementary · Meaning confusion

決る vs 増える

Q: What's the difference between 決る and 増える?

決る (きまる) means "to be decided" and 増える (ふえる) means "to increase, to multiply". Both describe a transition to a final or new state. A plan "is decided" (決る) once the necessary resources or participants "increase" (増える) to the required level for implementation.

Why JLPT N4 learners mix up 決る (きまる, “to be decided”) and 増える (ふえる, “to increase, to multiply”).

決る

きまる

to be decided

verb

増える

ふえる

to increase, to multiply

verb

Theme: Change & ProcessJLPT N4

Why these get confused

Both describe a transition to a final or new state. A plan "is decided" (決る) once the necessary resources or participants "increase" (増える) to the required level for implementation.

How to tell them apart

Anchor on the meaning, not the form. 決る (to be decided) and 増える (to increase, to multiply) live in adjacent semantic territory. Memorize the boundary, not just each word.
Read the example sentences below. Seeing each word in its natural context builds a faster lookup than studying the dictionary form alone.

In a sentence

決る (to be decided)

増える (to increase, to multiply)

これで私の悩みが増える。
このために費用が増える。

How JLPT tests this pair

On JLPT N4, this pair shows up as a vocabulary meaning question. You see one word and pick its English equivalent from four options — one of which will be the other word in this pair, chosen as a distractor precisely because of the overlap.

Sample item

「決る」の意味は？