If you have a percent button on your calculator, you may be wondering how to use it or how it works. Depending on the type of calculator you have, the percent button may function in different ways.
Also, on some calculators, the answer will be displayed after pushing the [%] button while on others you will have to push the [%] button and then the [=] button.
Important: If you use the percent button, it is important to determine how it functions on your calculator for the type of equation you have before relying on the answer.
Below shows how different types of calculators perform when using the percentage button:
90 [+] 10 [%] = 99 | calculates as: | 90 + (10% of 90) = 99 |
90 [-] 10 [%] = 81 | calculates as: | 90 - (10% of 90) = 81 |
90 [x] 10 [%] = 9 | calculates as: | 90 x (0.1) = 9 |
90 [/] 10 [%] = 900 | calculates as: | 90 / (0.1) = 900 |
10 [%] = 0 | calculates as: | calculator does not process |
90 [+] 10 [%] = 99 | calculates as: | 90 + (10% of 90) = 99 |
90 [-] 10 [%] = 81 | calculates as: | 90 - (10% of 90) = 81 |
90 [x] 10 [%] = 810 | calculates as: | 90 x (10% of 90) = 810 |
90 [/] 10 [%] = 10 | calculates as: | 90 / (10% of 90) = 10 |
10 [%] = 0 | calculates as: | calculator does not process |
90 [+] 10 [%] = 90.1 | calculates as: | 90 + (0.1) = 90.1 |
90 [-] 10 [%] = 89.9 | calculates as: | 90 - (0.1) = 89.9 |
90 [x] 10 [%] = 9 | calculates as: | 90 x (0.1) = 9 |
90 [/] 10 [%] = 900 | calculates as: | 90 / (0.1) = 900 |
10 [%] = 0.1 | calculates as: | 10/100 which is equal to 0.1 |
Texas Instruments TI-84 Plus: no percent button
Texas Instruments TI-81: no percent button
Texas Instruments TI-36X Pro: 90 [+] 10 [%] = 90.1
Texas Instruments TI-30SLR: 90 [+] 10 [%] = 99
Casio fx-9750GII: no percent button
Many simple calculators: 90 [+] 10 [%] = 99
The percent button does not function the same on all types of calculators and even on the same calculator the percent button may perform different functions depending on the type of equation entered. Compare your calculator's answers with the answers above to help determine how your percent button works.