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When I was learning how to use だけ and しか, I was told that だけ and しか both means
"only". But the latter requires the verb to be in the negative form.

For example:

> あの人だけが好きだ。  
>  I only like that person.
>
> これしか買わない。  
>  Only buy this.

But out of all the examples I've seen, だけ and しか are only used with nouns or
verbs. I never seen it used with amounts.

For example:

> A: これは高いね  
>  A: This is expensive, isn't it?
>
> B: 全然高くない！１００円 **だけ** だよ！  
>  B: It's not expensive at all! It's **only** 100 yen!

Is that correct? Also, can I use it wih other counter words like 一人 and 三つ?
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2016-11-30T14:18:06.707
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2016-11-30T15:10:17.173
2020-06-17T08:18:27.500
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question
grammar counters particle-しか
Can I use だけ and しか with amounts?
**Yes, you can.** For example:

> 二人 **だけ** が生き残った。 / Only two people survived.
>
> 君が払うのは100円 **だけ** でいい。 / You have to pay only 100 yen.
>
> りんごを5個 **だけ** 買った。 / I bought only 5 apples.
>
> ここには三人 **しか** いない。 / There are only three people here.
>
> 今は500円 **しか** 持っていない。 / I have only 500 yen now.
>
> その話を3割 **しか** 理解できなかった。 / I could understand only 30% of that story.

But your example sounds unnatural. The better translations are:

> **たった** （の）100円だよ！
>
> 100円（だけ） **しか** かからないよ！
>
> かかるのは100円 **だけ** だよ！

I think `100円だけだよ` is not enough for us to infer the subject (the price). So
in the second and third examples I added that information by the verb かかる (to
cost).

In the first example たった means "only; no more than," which is specific to
amounts. By using たった instead of だけ/しか, the subject becomes inferable.
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2016-11-30T15:10:17.173
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answer