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Rounds a number to a specified number of digits.
Number is the number you want to round.
Num_digits specifies the number of digits to which you want to round number.
If num_digits is greater than 0 (zero), then number is rounded to the specified number of decimal places.
If num_digits is 0, then number is rounded to the nearest integer.
If num_digits is less than 0, then number is rounded to the left of the decimal point.
ROUND(2.15, 1) equals 2.2
ROUND(2.149, 1) equals 2.1
ROUND(-1.475, 2) equals -1.48
ROUND(21.5, -1) equals 20
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