For the past 19 years, I've watched students struggle with word problems. A word problem is basically a problem where you need to apply your knowledge to a "real-life" type of situation.
Follow these steps and you will be solving these word problems without much trouble at all.
- Read the problem. Every word problem consists of two main parts: given information and a question that must be solved. In the next two steps, you will need to clearly identify what is given and what you are being asked to solve.
- Read the problem again. This time, write down all the information the problem gives you. Usually, I write the word "Given:" and list everything out.
- Read the problem again. This time, write down the question that you need to answer. After 19 years of working with students, I've seen hundreds of students go through a ton of of work without understanding what they're trying to solve. It's like leaving for a trip without a destination.
- Make sure you absolutely understand the problem. If drawing a picture helps you to understand, then by all means, draw a picture. Do whatever it takes to make sure you completely understand the problem. It's possible you don't have a clue how to solve it, but we will take care of that in some of the following steps. The main point is that by now you should understand what is given to you and what you must solve.
- Now, it's time to find a plan for solving the problem. A great place to start is to ask yourself, "What is this chapter trying to teach me?" If the chapter is about the Pythagorean theorem, then you can bet that you must use the Pythagorean theorem to solve the problem.
- Ask yourself, "Does this problem resemble or remind me of any of the other problems in the chapter?" You can even ask yourself, "Does this problem remind me of another problem I have already solved?"
- This step is called Mathematical Modeling. Write an equation that represents your problem. Usually, your chapter will have enough examples to help you do this.
- Solve the problem.
- Check your work. Does your answer make real life sense?
- Express your answer in a meaningful way. It's common for students to write something like, "x = 47." It would be more meaningful to write, "In order to maximize fuel economy, the optimal highway speed of this vehicle would be 47 miles per hour."
A shorter way of remembering these steps is:
- Read and understand the problem.
- Come up with a plan for solving the problem.
- Solve the problem.
- Check your answer.
- Express your answer.