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The same as any other number. Look one place to the right of the place you want to round up to. If that digit is 4, 3, 2, 1 or 0, get rid of it. If that digit is 5, 6, 7, 8 or 9, increase the place to the left of it by one and get rid of the rest.

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12y ago

What else can I help you with?