Sig Fig / Scientific Notation Help please?

Question

Write this number in scientific notion using three significant figures:

3,805,726 kilograms

Answer 1

3.80 x 10 **6

Answer 2

3.81x10^6

your initial value is 3,805,726.  first three figures are 380, but you round up your last value if the next figure is 5 or higher, thus it is 381, and it is 3.81x10^6 for it to be a significant figure.

the person below me is wrong, because he didnt round up

the person below the person below me is wrong, because he has 4 significant figures

the person below the person below the person below me is right.

Answer 3

3.81 x 10^6

Answer 4

3.806 * 10^6

Round the 5 up because the 7 is greater than 5

If the 7 had been exactly 5 round up if the next digit to the right was odd and down if the next digit right was even.  You need to do this so rounding errors do NOT accumulate