3 sentences

1. 他今天一共跑了四百米。

   tā jīn​tiān yī​gòng pǎo le sì​bǎi mǐ.

   He ran four hundred meters in total today.

   Source: Dong Chinese Dictionary

2. 总共有四百个名字。

   zǒng​gòng yǒu sì​bǎi gè míng​zi.

   There are 400 names in total.

   Source: OpenSubtitles

3. 这条跑道全长四百公尺。

   zhè tiáo pǎo​dào quán cháng sì​bǎi gōng​chǐ.

   This track is 400 meters long.

   Source: Dong Chinese Dictionary