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Step 1. Locate the rounding place digit. This is identified by
the column name. In addition, we sometimes refer to two place accuracy
and which means that the decimal should be accurate to two digits after
the decimal point. Similarly, for three place accuracy, four place accuracy.
Step 2. Determine the rounding place digit.
a. It stays the same
if the first digit to its right is a 0, 1, 2, 3, or 4.
b. It increases
by 1 if the digit to the right is a 5, 6, 7, 8, or 9. (If the rounding
place digit is a 9 and 1 is added, there will be a carry in the usual
fashion.)
Step 3. Change digits.
a. All digits to the left of the
rounding digit remain the same (unless there is a carry).
b. All digits
to the right of the rounding digit are changed to zeros.
Step 4. Drop zeros.
a. If the rounding place digit is to the left
of the decimal point, drop all trailing zeros.
b. If the rounding place
digit is to the right of the decimal point, drop all trailing zeros to
the right of the rounding place digit.
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