Elementary-level input/output tables are used to tell how one number is related to another. The tables help students understand how mathematics is used to quantify, compare, represent and model numbers.
Other uses of input/output tables include using repetition or regularity help in problem solving more efficiently. The tables represent how data can be organized and represented to give insight into relationships between quantities. In using the tables, students must determine a rule that can be applied as an equation to find a solution.
The concept of input/output tables is used to demonstrate the concept of functions by investigating growing patterns in a visual manner that elementary students can grasp.