To round off a number to the nearest 100, we find the multiples of 100 just before and after the number.
Next, we check the last two digits of the number. If the last two digits are less than 50, we round down the number to the lower value.
The multiples of 100 just before and after 8349 are 8300 and 8400.
Since 49 < 50, 8349 is rounded off to 8300.
We can see on the number line above that 8349 is closer to 8300 than 8400.