# Evaluating Expression

Lesson Objective
Learn how to evaluate expressions by substituting variables and perform the required calculations.
From the lesson algebra variables, you know that a variable is used to represent a certain number.

Therefore, you can evaluate an expression by substituting the each variable in the expression with its given number and perform the required calculations. This lesson shows you how.

# Study Tips

Tip #1
Remember to include brackets around the substituted variable. These brackets help to minimize calculation mistakes.
Tip #2
It is better to substitute the variables in the expression one at a time. You can substitute the variables all at once when you are more familiarized with the steps involved.
Now, watch the following math video to know more.

# Math Video

Click play to watch
Math Video Transcript

# Practice Questions & More

Multiple Choice Questions (MCQ)
Now, let's try some MCQ questions to understand this lesson better.

You can start by going through the series of questions on evaluating expression or pick your choice of question below.
1. Question 1 on the basics
2. Question 2 on the basics