How Do I Round 2.8749 To The Nearest Hundred?

The hundreds digit is zero, and the tens digit (0) is less than 5, so you keep the hundreds digit as it is.
The rounded value is 0.

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Perhaps you want to round to hundredths.
The hundredths digit is 7 and the thousandths digit (4) is less than 5, so you keep the hundredths digit as it is.
The rounded value is 2.87.