It is 600.
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by adding or subtracting the values of the digits in the front place
Front end rounding is using the first or the first two digits to make an estimation. 37145 would be rounded to 40000.
Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.Pi is infinite so there is no end to the amount of digits in it.
By using front end estimation, the numbers that you start of with have only one significant digit. It is, therefore, nonsense to have an answer with loads of significant digits.
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