Real Numbers is a free Android application developed by Sanket Sinkar that provides useful tools for students studying mathematics. The app allows users to enter numbers of their choice and find the highest common factor (HCF) by Euclid's Algorithm, prime factors of a natural number, HCF and LCM of three numbers by prime factorization, and whether a rational number has a terminating or non-terminating decimal expansion.

The app is specifically designed based on the first chapter of the Real Numbers subject for Class 10 CBSE board students, but it can also be helpful to students of other boards. With its simple interface and easy-to-use features, Real Numbers is a must-have tool for any student struggling with math problems related to HCF, LCM, and prime factorization.