Express 398753 correct to three significant figures
Answer Details
To express 398753 correct to three significant figures, we need to look at the first three digits of the number and round it off accordingly.
The first three digits of 398753 are 398. The fourth digit, which is 7, is greater than or equal to 5, so we need to round up the third digit.
Therefore, when we round off 398753 to three significant figures, we get:
$$
398753 \approx 399000
$$
So, the correct answer is 399000.