The irony is the 500 has ONE significant figure, therefore the answer cannot have more than one significant figure. The answer should be 2, most assuredly NOT 1.5290519. It doesn't matter how many digits his calculator can produce.
If Charlie is going to write a piece like this, at least get that right.
You may be right in this particular case - but a zero is not automatically a non-significant figure. Any given zero need not be the result of rounding; ratehr, it could be the result of an actual measurement.
Regards,
I’d even buy giving them the first zero in 500 as a significant figure, or calculating it as ‘450-550’, taking the first digit to the right of the decimal in the result as being rounded to the nearest half. But definitely not more precision than that.