4 as anything up to 4.05 will also be rounded to 4.0 4.05 will normally also be rounded to 4.0.
4.0/4
Its 4 because you look to the right of the digit that you want to round the number to, and if it is 5 or higher, you round that digit up one. If it is 4 or lower, then you keep that number. For example:4.569 rounded to 2 decimal places would be 4.57.
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