Khan Academy: Using Recursion to Determine Whether a Word Is a Palindrome

Learn how to use a SQL to update a database.

Learn how to use SQL to store, query, and manipulate data. SQL is a special-purpose programming language designed for managing data in a relational database, and is used by a huge number of apps and organizations.

An overview of Official SAT Practice from Khan Academy.

Learn how to pair Khan Academy's course mastery system with assignments in order to best meet the needs of all students.

For the first time ever, students have access to a free, personalized practice program for the SAT through an exclusive partnership between Khan Academy and the College Board. Read how tutors can use Official SAT Practice to help their...

Through an exclusive partnership between Khan Academy and the College Board, students and teachers now have access to world-class SAT preparation for free.

Khan Academy provides a plethora of SAT review resources. This site provides an overview of what Khan Academy provides and how student progress is tracked.

Check your understanding of using wires to represent bits, in this set of free practice questions designed for AP Computer Science Principles students.

See a good example of a mathematical construct that is a fractal known as a Sierpinski gasket.

Challenge problems practicing recursive powers.