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The standard is to round a half upwards.
Oh, dude, half of a dozen is 6, right? So, half of 6 is 3. And then half of 3 is like 1.5. So, half of half of a dozen is 1.5. Math can be fun when you break it down like this!
When you fold a paper in half, the line that runs down the center is called the crease.
The rule of thumb is: If the remainder is half again, or more, you round up. If it's less than half again, you round down. For example: 250.4 rounds down to 250. 250.6 rounds up to 251.
8*3.5 = 8*(3 + 0.5) which, applying the distributive property, = 8*3 + 8*0.5 = 24 + 4 = 28