“几”用来问数量，特别是小于十的数字。也可以表示不确定的几个。
“jǐ” yòng lái wèn shùliàng, tèbié shì xiǎoyú shí de shùzì. Yě kěyǐ biǎoshì bù quèdìng de jǐ gè.
“几” is used to ask about numbers, especially those smaller than ten. It can also mean an indefinite small number.
当我们想知道东西的数量，或者数量不多时，可以用“几”来问或说。
Dāng wǒmen xiǎng zhīdào dōngxi de shùliàng, huòzhě shùliàng bù duō shí, kěyǐ yòng “jǐ” lái wèn huò shuō.
Use 几 to ask about a small number of things, or to say there are several of something.
多少 also asks how many or how much, often for numbers expected to be over ten.
几个 uses 几 to mean a few or several when talking about countable things.
几岁 is the common way to ask a young child's age.