The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
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when rounding you want to choose an answer with the lowest significant figures to have a better answer choice
It depends on the number of significant figures from two numbers you are multiplying. But when multiplying you use the same number of significant figures from the numbers you are multiplying with the LEAST number of significant figures. Example: 92,873.239 * 2 = 200,000 (because the number 2 has only 1 significant figure even tho 92,873.239 has 8 significant figures your answer still only has 1 significant figure)
Four, if you assume that the final zero is not there simply to use up space!
Assuming that the trailing 0s are not there simply to use up ink, the answer is 5.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.