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Percent Problems involving Simple Interest

Videos, worksheets, and solutions to help Grade 8 students learn how to solve percent problems involving simple interest.

What is the Simple Interest Formula?
Simple Interest = principal × rate × time
I = P × r × t

How to use the Simple Interest Formula?
Solve word problems using the "interest" formula, which states: interest = principal × rate × time

In this tutorial, we demonstrate how to use the formula for simple interest, I = Prt.
Understanding Simple Interest and Compound Interest
This video makes clear the difference between simple interest and compound interest.


Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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