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Fourth grade math: how about: how much is 369?
Approximately equal to 370

Round up or down

If the last digit is greater than or equal to 5, the previous digit, such as 28, can be said to be about 30; If it is less than 5, it will not change. For example, 24 is about 20.

369, the last number is greater than 5, so the previous hexadecimal 1 is 7, which is 370.