CAS Calculator FAQ

...programs and documents?

Not all calculators have the capability to hold programs and documents. If the calculator you bring to take the ACT Mathematics Test cannot hold programs and documents, then these clarifications do not affect you.

A computer algebra system typically solves equations algebraically, simplifies expressions, performs algebraic manipulations, and performs exact arithmetic (for example, does not round or truncate decimal places). A computer algebra system is also a system, potentially doing many levels of analysis at the same time. Examples include, but are not limited to, Zoom-Math, APP4MATH, F2K, etc.

A computer algebra system has a valid place in mathematics, and learning how to use the tool effectively is valuable. The ACT Mathematics Test does not assess this skill. Being college and career ready in mathematics requires that a student be able to analyze algebraic expressions and equations, knowing what to do in order to solve problems.

Apps that have CAS functionality must be removed as well. Even though your calculator may have separate buttons or places to store apps versus programs, an app is a kind of program. For the purposes of this policy, the definition of “program” includes apps. Any time the word “program” is used, it should be interpreted to include apps as well.

Only programs that have CAS functionality must be removed. All documents, however, must be removed regardless of their purpose or function.

Given the proliferation of math resources/tools, ACT is not fully familiar with all mathematics programs and apps that are available for use on a calculator. If you are unsure whether a program or app is prohibited, our recommendation is to not install it or remove it before test day.

ACT's calculator policy calls for the programs to be removed. Disabling programs – for example, putting the calculator in Press to Test mode – is not enough.

...how do I get them back on it after I test?

Many calculators have a way of restoring programs if they have been saved outside the calculator. If you have programs that you need to remove and you do not know how to save and restore, we recommend you check with your calculator company for details well in advance of test day.

The kinds of mathematics-related programs permitted for the ACT allow students to use the calculator capabilities to do the routine calculations yet require students to show their analysis skills by choosing the right operations and process. Mathematics-related programs are allowed if they are single-purpose – for example, finding numeric solutions to a quadratic equation. A student must choose the right program for the right purpose. This is much the same as choosing the right formula for the right purpose.

Programs must be written in the language of the calculator. Programs written in a different language, compiled, and loaded onto the calculator are not allowed. In this way, the programs can be examined on the calculator and will use calculator functions. Programs must not be lengthy. The limit is 25 logical lines of code. Programs cannot call another program. Techniques such as compressing code into a data statement are not allowed as a way of getting around this limit. Programs are allowed to change the value of system variables so that results may, for example, be graphed through the normal calculator graphing interface.