Checking Solutions for Reasonableness

Checking Solutions for Reasonableness

Introduction

After solving a real-world problem with rational numbers, it is important to check whether the answer is reasonable. A reasonable solution is one that makes sense...

You are visiting a comic book store with 25 dollars in your wallet. A comic book costs 8.40 dollars, and you want to buy 3 of them.

You quickly look at the price and think, “8.40 is close to 8 dollars, and 3 times 8 is 24 dollars. I have 25 dollars, so buying 3 comic books should fit my budget.”

But then you stop and ask yourself, “...