Question

round off 0.00039 to three digits​

Answer 1

Answer:

0.039

Explanation:

round is done by taking 3 digits after decimal

Answer 2

Answer:

0.00039 contains only 2 significant figures 3 and 9. zeros to the right of decimal point and left are not significant. Therefore the answer is 3.90*10^-4 . here 3 significant figure 3, 9 and zero. All zeros to the right of decimal place after a non zero digit ( here after 9) are significant. hope it is the right answer