Identify Number Parts: Identify the whole number part and the decimal part of the number 3.1. The whole number part is 3, and the decimal part is .1.
Determine Rounding Rule: Determine the rule for rounding to the nearest whole number. If the decimal part is 0.5 or greater, round up. If it is less than 0.5, round down.
Apply Rounding Rule: Apply the rounding rule to 3.1. Since the decimal part (.1) is less than 0.5, we round down. 3.1 rounded to the nearest whole number is 3.
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