Question

if a rounded result is very different from the answer being checked, you should...
ignore the rounded result.
check the math for any mistakes.
round to a different place value.
do nothing, because both values should be different.

Explanation:

A large discrepancy between a rounded result and the original answer indicates a potential error in calculation or rounding process, so verifying the math is the appropriate action. Ignoring the result, changing the rounding place, or doing nothing does not address the underlying issue of a possible mistake.

Answer:

B. check the math for any mistakes.