To convert the fraction 7/12 to a decimal, you need to divide the numerator (7) by the denominator (12).
When you perform the division, you get:
7 ÷ 12 = 0.58333…
This decimal is a repeating number. To round it to the nearest thousandth, you look at the third digit after the decimal point, which is 3. The digit that follows it is 3 as well.
According to the rounding rules, if the next digit is 5 or more, you round up. Since it’s 3, you keep the 3 as it is.
Therefore, rounded to the nearest thousandth, 7/12 is 0.583.