Rounding is used to eliminate figures that are not significant. When the digits to be rounded are to the left of the decimal point, the digits are replaced by zeros. For example, if you need to reduce the area of an acre, 43,560 ft2, to two significant digits, round to 44,000 ft2. When the digit being dropped is greater than 5, add one to the next digit remaining. When the digit being dropped is less than 5, the first remaining digit is unchanged. If the digit being dropped is exactly 5, leave the remaining digit even. When the remaining digit is odd, add one, if it is even, leave it as is. For example, if the number 43,560 is rounded to one significant digit, the answer is 40,000; rounded to two it is 44,000; and rounded to three it is 43,600.
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