According to IDEA, the mathematical formula for determining the discrepancy that defines learning disability is

To determine the discrepancy that defines a learning disability according to IDEA, you can follow these steps:

1. Identify the student's current level of academic achievement in a specific area, such as reading or math. This can be done through assessments, tests, or other measures.

2. Determine the student's expected level of academic achievement based on their intellectual ability or potential. This can be determined through IQ tests or other assessments.

3. Calculate the difference between the student's current level of academic achievement and their expected level of academic achievement. This difference is known as the "discrepancy."

4. Compare the calculated discrepancy to the criteria set by IDEA to determine if it meets the definition of a learning disability. IDEA provides guidelines on what level of discrepancy is considered significant enough to indicate a learning disability.

It's important to note that the specific formula for calculating the discrepancy may vary depending on the state or school district. However, the general concept of comparing a student's current and expected levels of academic achievement remains consistent.