How common it is
亿 appears often in everyday Chinese, so it is worth practicing early and reviewing often.
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Pronunciation focus
Say yì slowly first, then repeat it in a short phrase. Listen for the tone shape.
Usage note
亿是一个很大的数字，等于一万万，用来表示很多的数量。
Yì shì yīgè hěn dà de shùzì, děngyú yī wàn wàn, yòng lái biǎoshì hěnduō de shùliàng.
Hundred million is a very large number, equal to ten thousand ten thousands, used to represent a large quantity.
Context note
在中文里，亿常用于人口、金钱或距离等大数字，比如中国有十四亿人。
Zài zhōngwén lǐ, yì cháng yòng yú rénkǒu, jīnqián huò jùlí děng dà shùzì, bǐrú Zhōngguó yǒu shísì yì rén.
In Chinese, hundred million is often used for large numbers like population, money, or distance, such as China has 1.4 billion people.
5 examples
中国有十四亿人。
zhōng guó yǒu shí sì yì rén。
China has 1.4 billion people.
这个城市有一亿棵树。
zhè ge chéng shì yǒu yí yì kē shù。
This city has one hundred million trees.
他存了一亿元。
tā cún le yí yì yuán。
He saved one hundred million yuan.
地球上有七十亿人。
dì qiú shàng yǒu qī shí yì rén。
There are seven billion people on Earth.
这个图书馆有一亿本书。
zhè ge tú shū guǎn yǒu yí yì běn shū。
This library has one hundred million books.
5 mini stories
森林里有一亿片叶子。每一片都不同。
sēn lín lǐ yǒu yí yì piàn yè zi。 měi yí piàn dōu bù tóng。
There are one hundred million leaves in the forest. Each one is different.
星星有一亿颗。它们在夜空中闪烁。
xīng xīng yǒu yí yì kē。 tā men zài yè kōng zhōng shǎn shuò。
There are one hundred million stars. They twinkle in the night sky.
蚂蚁王国有一亿只蚂蚁。它们一起工作。
mǎ yǐ wáng guó yǒu yí yì zhī mǎ yǐ。 tā men yì qǐ gōng zuò。
The ant kingdom has one hundred million ants. They work together.
花园里有一亿朵花。五颜六色真美丽。
huā yuán lǐ yǒu yí yì duǒ huā。 wǔ yán liù sè zhēn měi lì。
There are one hundred million flowers in the garden. They are colorful and beautiful.
大海里有一亿条鱼。它们游来游去。
dà hǎi lǐ yǒu yí yì tiáo yú。 tā men yóu lái yóu qù。
There are one hundred million fish in the sea. They swim around.