Sequences are patterns of numbers that follow a particular set of rules. Whether new term in the sequence is found by an arithmetic constant or found by a ratio, each new number is found by a certain rule—the same rule—each time.

There are several different ways to find the answers to the typical sequence questions—”What is the first term of the sequence?”, “What is the last term?”, “What is the sum of all the terms?”—and each has its benefits and drawbacks. We will go through each method, and the pros and cons of each, to help you find the right balance between memorization, longhand work, and time strategies.

**This will be your complete guide to ACT sequence problems**—the various types of sequences there are, the typical sequence questions you’ll see on the ACT, and the best ways to solve these types of problems for your particular ACT test taking strategies.