# Factorial Calculator

You can use this factorial calculator to calculate the factorial of a positive integer number below 170. Simply enter the desired number and click the "factorate" button. The result will be shown in the output section.

## How do you calculate factorials?

To calculate a factorial, you multiply a given positive integer (n) by all positive integers less than it down to 1. It is denoted by the symbol "!".

Mathematically, the factorial of a number n is represented as n!, and it is computed as:

n! = n × (n - 1) × (n - 2) × ... × 2 × 1

For example:

• 5! = 5 × 4 × 3 × 2 × 1 = 120
• 7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040

Factorials are typically used in mathematics, statistics, and combinatorics to calculate permutations and combinations, solve probability problems, and in various other mathematical calculations.

When calculating factorials for larger numbers, it can become computationally intensive. Therefore, it's important to note that factorials grow rapidly, and beyond a certain point, they exceed the limits of numerical representation in many computer systems. In practice, factorials are usually computed using specialized algorithms or functions available in programming languages or scientific calculators to handle larger numbers efficiently.

## How do you Factorise easily?

Factorizing an expression or number involves breaking it down into its prime factors. There are several methods and techniques for factorization, depending on the type of expression or number you are working with. Here are a few strategies to help factorize easily:

1. Prime factorization: Prime factorization involves breaking down a number into its prime factors. Start by dividing the number by the smallest prime number (2) and continue dividing by prime numbers until the result is a prime number. Repeat this process for each factor until you have expressed the number as a product of prime factors. For example, to factorize 24, you divide it by 2, yielding 12, then divide 12 by 2 again to get 6, and finally divide 6 by 2 to get 3. So, the prime factorization of 24 is 2 × 2 × 2 × 3 = 2^3 × 3.

2. Factoring by grouping: This method is commonly used for factoring algebraic expressions with multiple terms. It involves grouping terms in a way that allows you to factor out a common factor. For example, in the expression 2x + 4y + 3x + 6y, you can group the terms as (2x + 4y) + (3x + 6y). Then, factor out the common factors from each group, resulting in 2(x + 2y) + 3(x + 2y). Notice that (x + 2y) is a common factor in both groups, so you can further factorize the expression as (x + 2y)(2 + 3).

3. Difference of squares: This technique applies when you have an expression that can be written as the difference of two perfect squares. The pattern is a^2 - b^2 = (a + b)(a - b). For example, to factorize x^2 - 9, you recognize that it can be written as (x + 3)(x - 3) using the difference of squares formula.

4. Quadratic factoring: Quadratic expressions of the form ax^2 + bx + c can be factored using various methods, such as factoring by grouping, difference of squares, or using the quadratic formula. This involves finding two binomials that, when multiplied together, give you the original quadratic expression. The process often involves factoring out common factors or finding two numbers whose sum or difference is equal to the coefficient of the middle term.

It's important to practice and familiarize yourself with different factoring techniques, as there isn't a single approach that works for all situations. Additionally, using online tools or factoring calculators can be helpful in quickly determining the factors of a number or expression.

## How to simplify a factorial?

Simplifying factorials involves reducing or simplifying the expression to its simplest form. Here are some techniques to simplify factorials:

1. Basic factorial simplification: If the factorial expression involves small numbers, you can evaluate the factorial by multiplying the numbers together. For example, 5! can be simplified to 5 × 4 × 3 × 2 × 1 = 120.

2. Using known factorial values: Some factorials have well-known values. For instance, 0! and 1! are both equal to 1. Similarly, 2! = 2 and 3! = 6. By recognizing these values, you can simplify factorials that involve these numbers.

3. Simplifying factorials with common factors: If a factorial expression has common factors in the numerator and denominator, they can be canceled out. For example, (5!)/(3!) can be simplified as (5 × 4 × 3 × 2 × 1) / (3 × 2 × 1). The common factors of 3!, which are 3 × 2 × 1, can be canceled out, leaving only 5 × 4 = 20.

4. Using factorial properties: Factorials have certain mathematical properties that can aid in simplification. One property is n! = n × (n-1)!. This means that you can rewrite a factorial expression with a smaller number. For example, 6! can be simplified as 6 × 5!, and then further simplified using the previous techniques if applicable.

5. Combining factorials: In some cases, you may encounter expressions with multiple factorials. You can simplify such expressions by applying the properties of factorials and combining like terms. For example, (5!)/(3!) + (4!)/(2!) can be simplified as (5 × 4 × 3 × 2 × 1) / (3 × 2 × 1) + (4 × 3 × 2 × 1) / (2 × 1). By canceling out common factors, you can simplify further.

Remember that factorials grow rapidly, so simplifying factorials may not always result in a simple numerical value. Instead, the goal is to reduce the expression to its most concise form by canceling out common factors or utilizing known factorial values.

## What is a factorial of 5?

The factorial of 5, denoted as 5!, is calculated by multiplying all positive integers from 1 to 5 together. It can be expressed as:

5! = 5 × 4 × 3 × 2 × 1 = 120

Therefore, the factorial of 5 is 120.

## What is a factorial of 6?

The factorial of 6, denoted as 6!, is calculated by multiplying all positive integers from 1 to 6 together. It can be expressed as:

6! = 6 × 5 × 4 × 3 × 2 × 1 = 720

Therefore, the factorial of 6 is 720.

## How large is 52 factorial?

The factorial of 52, denoted as 52!, is an extremely large number. To give you an idea of its magnitude, let's calculate it:

52! = 52 × 51 × 50 × ... × 3 × 2 × 1

The exact value of 52! is a very large number with 68 digits. It is approximately equal to:

8.0658175 × 10^67

So, 52 factorial is approximately 8.0658175 × 10^68.

As you can see, factorials grow rapidly as the number increases, resulting in extremely large values.