A rectangle has a length of 9.00 inches and a width of 4.25 inches. What is the area in square inches? Round to the correct significant digits.

Question

anonymous · Answer

The area of a rectangle is just $\huge  l*w$.

If $l=9.00$ and $w=4.25$, 

then the area of the rectangle is 
$\huge 9.00*4.25=?$.

anonymous · Answer

i know that but i got it wrong because i dont know how to round it

anonymous · Answer

If you know it, what is it? :)

anonymous · Answer

38.25

anonymous · Answer

but how do you round the significant digits?

anonymous · Answer

Okay, so to round it up, notice that both have three significant digits. So your answer must also have three significant digits.

anonymous · Answer

$\huge 38.25$ has four significant digits. You want three, so you will round it to the nearest tenths.

anonymous · Answer

so its 38.3?