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How do you round to 3 significant figure?
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the fourth significant figure. 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.
Is considered a significant digit when it is to the left or the right of the decimal point and do it follows a non-zero digit?
If I understand this convoluted sentence correctly, then think it is true.
What is a significant digit when it is to the left or right of the decimal and it follows a non zero digit?
All digits between the first non-zero digit and the last non-zero digits are significant. Some would argue that trailing 0s are significant since they are an indication of the precision of the number.
How do you round to the 3rd significant figure?
To round a number to a particular digit, look at the digit immediately to the right of your target. 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.
How do you add 3 digit numbers?
From right to left.
