Mental arithmetic is the process of performing calculations in one's mind, without the aid of external tools such as calculators or abacuses. It is a skill that requires practice and can be developed through various techniques such as visualization, chunking, and memorization of basic arithmetic facts.

Solving the Rubik's Cube requires spatial reasoning skills, pattern recognition, and problem-solving abilities. The puzzle has also been used as a tool for teaching various concepts in mathematics and computer science, such as group theory and algorithms.