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1) As many as you need for a particular purpose.
2) In any case, since this number is probably the result of some calculation, the answer should not look more accurate than what is justified by the original data. For example, if you multiply two numbers, one with 4, one with 5 significant digits, the answer should not have more than 4 significant digits.
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How many significant figures should be in the resulting calculations?
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
How many significant figures should be reported in the answer 5321?
The number 5321 has 4 significant figures.
How many significant figures should be reported in the answer to 14.1 9?
There are 4 significant figures to be reported.
When multiplying or dividing measurements how many significant figures should the answer contain?
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
How many significant figures should the product of 2.16 and 0.18 have?
2. The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
