Question

the number of significant fugures in proper number 420

Answer 1

Actually both the 4 and the 2 are significant figures in the number 420.  And the 0 can be considered significant in certain mathematical situations.  Significant figures are the ones that indicate the precision of a number, so if 420 is in a context of being precise (like 420 rather than 419 or 421) then the 0 can be considered significant. If the 420 is in the context where you might be rounding answers to the nearest 10, then the 0 is not significant.  There is mathematical notation that is used to indicate where the last significant figure in a number is (usually it is a bar over the last figure). So if 20,000 is precise to the hundreds then it would be written with a bar over the third zero from the right.

please give me as brainlist

Answer 2

there are 2 significant figure in 420..coz zero is not considered as significant figure.