Strive to find ways to check
your answer using both:
It is important to anticipate what the answer will be. If there
is a discrepancy between the expected answer and the calculated answer, continue
to recalculate the values and reconsider your expectations until you decide which
is correct. Sometimes our intuition is not correct and we must revise our thought.
However, if we do not start with an idea of the result we are expecting, then
we have nothing to gage our calculation against. This can be dangerous when your
result is used to make decisions that affect human health and economy, and when
a "key" is not available to confirm your result.
alternative means of calculating the same value.