Express 398753 to three significant figures.

Question

ScanSolve AI Tutor · Accepted Answer

To express 398753 to three significant figures, we follow these steps:

Identify the first three significant figures.
The first three significant figures in 398753 are 3, 9, and 8.
Look at the digit immediately after the third significant figure.
The digit after 8 is 7.
Round up if the digit is 5 or greater, otherwise keep it the same.
Since 7 is greater than or equal to 5, we round up the third significant figure (8) by adding 1 to it. This makes it 9. All subsequent digits are replaced with zeros.
Write the rounded number.
Rounding 398753 to three significant figures gives 399000.

Comparing this with the given options:
A. 398000
B. 398800
C. 399000
D. 398700
E. 390000

The correct option is C.

The final answer is $\boxed{\text{C. 399000}}$

Answer