Weightage of Number system in CAT?

Hai Vikash,
Around 2-4 questions come from Number Systems every year. The major areas covered in Number Systems are Basics of Numbers, Divisibility Rules, Divisibility and Factors, HCF / LCM, Finding Out Last Digit, Finding Out Last Two Digits, Number of Trailing Zeroes, Highest Power of a Number in a Factorial, Finding out Remainders, Base Systems.