The Chinese sign for 10 is like a cross - "shí". Adding a horizontal stroke at the bottom results in "tǔ" – land. Also see e.g. «Writing: Shu, the vertical stroke» and «Writing: Heng, the horizontal stroke».
This video (see at YouTube) is of beginner level difficulty. It has subtitles in Pinyin and Chinese characters. We especially recommend this video.
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