Zero is Considered a digit, but there has been much discussion on this topic:
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To write 0.009 in words, you would say "zero point zero zero nine." This is because the first digit after the decimal point is read as "zero," the second digit as "zero," and the third digit as "nine."
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tenths place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
The digit zero comes from where all zeros come from.........................think bout it you will see what i am talking bout
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tens place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the fifth decimal place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.