80 – 50 = 30

八十减五十等于三十。

bāshí jiǎn wǔshí děngyú sānshí

More information on the Chinese numbers you can find in The Chinese Numerals for Businessmen by Polina Shinkina http://www.lulu.com/content/e-book/the-chinese-numerals-for-businessmen/19124210 or in each Chinese textbook by Polina Shinkina on http://www.lulu.com/spotlight/polina985

the-chinese-numerals-for-businessmen

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