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It's possible to work out the digits in the decimal expansion of pi via many methods. The simplest to explain is to measure a large circle with a tape measure, but there are many better, more mathematical algorithms, and computer programs developed specifically for calculating pi.

The current world record is 1,241,100,000,000 decimal digits. That's more than a trillion: http://www.super-computing.org/pi_current.html

See here for more: https://secure.wikimedia.org/wikipedia/en/wiki/Computing_%CF%80

Q: How do you know what number comes next in pi if you want to write it to more decimal places than anyone ever has before?

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To find the number of decimal places in a product of decimal numbers, add up the total number of decimal places in each of the factors. For example, if you have 2.5 multiplied by 4.75, there are two decimal places in 2.5 and two decimal places in 4.75, so the product will have a total of four decimal places.

three

If the two numbers have x and y decimal places respectively, then the raw product (before deleting and trailing 0s) has (x + y) digits after the decimal point.

True

The three decimal places of that number are 978.

Related questions

There will be five decimal places.

In Excel, the second argument of the Round function specifies the number of decimal places to round to. If this number is negative, it rounds to corresponding digits before the decimal point.

To find the number of decimal places in a product of decimal numbers, add up the total number of decimal places in each of the factors. For example, if you have 2.5 multiplied by 4.75, there are two decimal places in 2.5 and two decimal places in 4.75, so the product will have a total of four decimal places.

2

three

5 of them.

At most 3.

5.49

If the two numbers have x and y decimal places respectively, then the raw product (before deleting and trailing 0s) has (x + y) digits after the decimal point.

True

probably 3, thousandths place.

The three decimal places of that number are 978.