Mr. Stevenson owns a bookstore. At the beginning of January, he had 528,741 books in his store. He sold 3,582 books that month and gave away 863 books Part A How many books are left in the store? Estimate by rounding each number to nearest thousand.

Part B use standard subtraction algorithm to find the exact number of books left in the store. Is your answer reasonable or unreasonable based on answer in part A? Explain