Читать книгу All the Math You'll Ever Need - Steve Slavin - Страница 27

When you use a calculator for division, it helps to have an idea of what a reasonable answer will look like. If you divide 3,482,603 by 274 and get an answer of 12, bells should go off to say that can't possibly be right. Why doesn't that sound right? Well, think about dividing with easier numbers. 3,482,603 is larger than 3,000,000 and 274 is around 300. 3,000,000 ÷ 300 = 10,000 so the answer to the actual problem should be in that neighborhood, which means 12 must be wrong. In fact, 3,482,603 ÷ 274 = 12,710 with a little left over.