Least Common Multiple

In this post we explain the basics of Least Common Multiple(LCM). We will understand the techniques on how to find the LCM of two or more numbers. Under the “Problems on LCM” section we will solve some important aptitude problems on LCM. Understanding Least Common Multiple   Problems on LCM

Highest Common Factor

In this post we explain the basics of Highest Common Factor (HCF) also known as the Greatest Common Divisor(GCD) or the Greatest Common Factor(GCF). We will understand the techniques on how to find the HCF of two or more numbers. Under the “Problems on HCF” section we will solve some important aptitude problems on HCF. […]

Highest Power of a Number in a Factorial

In the video below, we will have a look at the techniques to calculate the Highest Power of a Number in a Factorial. Factorial of a number n is given by $n! = n$ x $(n-1)$ x $(n-2)$ x $(n-3)…2$ x $1$ Given a number x, how do we find the highest power of x in […]

Problems on Divisors of Number

In this post we will have a look at the problems on the number of divisors of a number. We will see how to find the number of divisors of a number, number of even and odd divisors of a number, sum of divisors of a number and product of divisors of a number. The […]

Absolute Value Equations and Inequalities

Whats is Absolute value? Absolute value (or Modulus) represented by |x| of a real number x is the non-negative value of x without regard to its sign. For example: Absolute value of -3 => |-3| = 3 Absolute value of 7 => |7| = 7 Absolute value as distance? We can also think of absolute […]

How to find Remainders – Basics

Basics of Calculating Remainders [latexpage] In this post we will have a look at the basics of calculating remainders like the remainder of a sum, remainder of a product and understand what is meant by negative remainders. We will see how to use these concepts to calculate the remainders of large numbers. What is a […]

Last Two Digits of Large Number

Here, we will see how to find the last two digits of a large number. We will first understand how to find the last two digits of a product and  then we will try to find the last two digits ( i.e digits in tens and units place) of a large number in the form ${x^y}$. At […]

Units digit of a number raised to power

Here, we will see how to find the units digit of a number that is in the form ${x^y}$. We will first try to understand what is a units digit, then we will look at the technique to find the units digit of large powers and then using this technique we will solve some problems […]