In these two videos we talk about how to find out the factors of a particular number. We discuss how to just look at a number and say if it is divisible by 2, 3, 4, 5, etc. We also discuss divisibility by bigger prime numbers using the seed number method.

These videos belong to the Number System section of Quantitative Aptitude for the Common Admission Test (CAT). Please note that CAT 2009 is going to be online and a computer based test.