Theory

Round to nearest integer

When rounding to integers, look at the first decimal. If that digit is 0,1,2,3,0,1,2,3, or 4,4, round down, and if it's 5,6,7,8,5,6,7,8, or 9,9, round up. See the following examples.

Number ≈\approx
639.693639.693 640640
2.32.3 22
90.690.6 9191
16.0616.06 1616

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