How to Evaluate Mathematical Expressions

Play the numbers game!

Evaluating mathematical expressions can be very intimidating to students. The truth is, however, they are quite simple once you learn a few basic steps. The following article will provide a step by step example on how to solve a mathematical expression.

Instructions

1. Use the example 3x-2=10. This is a simple mathematical expression that is easy to solve. Using basic math skills this problem can be solved in a few seconds.

2. Get the 'x' by itself. We will do this by using reverse operations. First, add 2 to both sides. You will then have 3x=12.

3. Divide both sides by 3. This will leave us with the final answer, x=4.

4. Check your answer. Plug 4 in for 'x' in the original expression. Your answer should be equal.

Tips & Warnings

• When solving more complex problems, remember "PEMDAS." This is an easy way to remember the order of operations--parenthesis, exponents, multiply, divide, add, subtract.

Resources

• Read this Article in Spanish