Yes, because it is not that easy to completing a table. There is some cases like, answers are not accurate to a given numbers. If you have an effort to re-check the answers you got. You will get what accurate answers you are finding. There is always a hole in filling the blank of tables and you will ask and think, math is really difficult, how come it is wrong again? In answering a table, you must have effort to try again and work hard because it always an error.
