atai wo kakuninsita.

Most commonly:

• If 値 means value / numerical value, it is usually read あたい
  → あたいをかくにんした
• If 値 means price, it may be read ね
  → ねをかくにんした

So the reading depends on the meaning and context.

Also, the particle を is pronounced お in modern Japanese, even though it is written を.

を marks the direct object of the verb.

In this sentence:

• 値 = the thing being checked
• 確認した = checked / confirmed

So 値を確認した means that 値 is what was checked.

A very literal breakdown would be:

• 値 = value
• を = object marker
• 確認した = checked / confirmed

確認した is the past tense of 確認する.

• 確認する = to check, confirm, verify, make sure
• 確認した = checked, confirmed, verified

In many situations, 確認する feels a little more like verify/check carefully than just look at.

So compared with 見た (looked at / saw), 確認した suggests that someone checked something to make sure it was correct.

Because 確認する is a suru-verb.

Many nouns in Japanese can become verbs by adding する:

• 確認 = confirmation / checking
• 確認する = to confirm / to check

To make it past tense:

• する → した

So:

• 確認する = check
• 確認した = checked

It is in the plain past form.

• 値を確認した。 = plain style
• 値を確認しました。 = polite style

The plain form is used in:

• casual conversation
• diary-style writing
• narration
• reports or notes, depending on tone

So this sentence is not rude by itself; it is just non-polite/plain.

The subject is omitted, which is very common in Japanese.

So 値を確認した。 could mean:

• I checked the value.
• He checked the value.
• She checked the value.
• We checked the value.

Japanese often leaves out information that is understood from context.

Japanese does not have articles like English a / an / the.

So 値 by itself can mean things like:

• a value
• the value
• the price
• a price

The exact meaning depends on context.

That is why English translations often need to add words that are not explicitly present in the Japanese sentence.

By itself, 値 does not clearly show singular or plural.

So depending on context, it could refer to:

• a value
• the value
• values

Japanese nouns usually do not change form for plural the way English nouns do.

If the speaker wants to make plurality especially clear, they usually do it through context or additional words, not by changing the noun itself.

The pattern is:

noun + を + verb

Here:

• 値 = noun
• を = object marker
• 確認した = verb in past tense

So this is a very standard Japanese sentence pattern:

[object] + を + [action]

In English order, it becomes:

checked the value

with the subject left unstated.

Because the nuance is different.

• 見る = to see / look at
• 確認する = to check / verify / make sure

If you say 値を見た, it can simply mean looked at the value.

If you say 値を確認した, it suggests something more purposeful, like:

• checking whether it is correct
• verifying the number
• making sure the value is what it should be

So 確認した sounds more deliberate and precise.

Normally, standard Japanese writing does not use spaces like this.

It would usually be written as:

値を確認した。

Spaces are often added in learning materials to make the parts easier to see:

• 値
• を
• 確認した

So the spaced version is just a teaching aid, not normal everyday formatting.