Calculating Percents With The TI-30XS

In this lesson, we’ll explain how to calculate percents and convert decimals to percents and vice versa with the Texas Instruments model TI-30XS. This lesson is part of our free online GED classes.

The TI-30 XS is the only calculator allowed on the GED exam and knowing how to use it effectively will definitely boost your GED Math score!


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On the Math test, there will be a few questions that involve percents.

In this video, you will learn how to solve basic percent problems.

For example, find 25% of 100.

First of all, you need to know that, “of”, means times. So we need to type 25% times 100.

The percent sign is located above the left parenthesis button, so we will need to use the 2nd button to activate the additional function of this key.

Let’s get started.

Press 25 and then Press 2nd.

Now we can press the left parenthesis sign to activate the calculation of percentages.

Press times for multiplication.

And now Press 100.

Finally press enter.

And here is our result. 25% of 100 equals 25.

1. What number is \(22.4 \% \) of \(125?\)

Question 1 of 2

2. What number is \(159\%\) of \(185?\)

Question 2 of 2


Next lesson: Converting decimals to percent-with a GED Calculator (TI-30XS)

Notice: The free resources available on Gedeno are courtesy of Onsego’s extensive Online GED Prep Program. For full instructions on how to use the TI-30XS on the GED test, go to the Onsego website.

Last Updated on February 14, 2024.