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Why does 3.50 round up to 4.00?
When the number you're going to round is exactly between the lower and the bigger number, you always round up. It can't be explained. It's just how it is.
Round 297.85 square kilometer to the nearest tenth of a square kilometer?
297.8 square kilometres. Now here is a minor digression that you may (or may not) find is of interest: There are different views on how the digit 5 should be rounded - up or down. 1,2,3 and 4 are always rounded down; 6,7,8 and 9 are always rounded up and 0 does not need rounding. So if you always round 5 down, you will round down 5 numbers and up 4 and so introduce a downward bias in your work. Conversely, if you always round up you will introduce an upward bias. You could randomly decide to round up or down but this makes it more difficult for others to follow what you have done. The recommended answer is to round 5 so that the previous digit is EVEN. Thus 0.15 is rounded up to 0.2 and 0.45 is rounded down to 0.4
When should a digit be rounded up and when should it be rounded down?
When the digit immediately to the right of it is 0-4 round down. If it is 5-9 round up.
What is 64 out of 75 as a decimal rounded to the nearest thousandth?
64.000
When dealing with money which decimal place should you always round?
You should round to two decimal places unless the number is large - like the US national debt, for example.
