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4.2 is rounded to 4. If the decimal is .5 or greater than you round up. If it is below .5 then you round down.
An example is 4.5 would be rounded to 5. So would 4.6, 4.67, 4.6789, 4.51
Furthermore, 4.4, 4.3, 4.2, 4.1 is rounded to 4.
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