Answer:
31.459
Explanation:
Rounding a number to the thousandths is 3 numbers behind the numbers in the ones places so putting this to knowledge all we have to do is count 3 numbers back from the ones and take out the rest to get our answer.
The thousandths place is the 3rd digit to the right of the deicmal point, so that number would be 9.
Since the number to the right of 9 is less than 5, we don't round up, but we round down.
So our answer will be 31.459.
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