# What is GCF of 27 and 81?

GCF of 27 and 81 is 27

#### How to find GCF of two numbers

 1.   Steps to find GCF of 27 and 81 2.   What is GCF of two numbers? 3.   What are Factors? 4.   Examples of GCF

### Example: Find gcf of 27 and 81

• Factors for 27: 1, 3, 9, 27
• Factors for 81: 1, 3, 9, 27, 81

Hence, GCf of 27 and 81 is 27

#### How do we define GCF?

In mathematics we use GCF or greatest common method to find out the greatest possible positive integer which can completely divide the given numbers. It is written as GCF (27, 81).

#### Properties of GCF

• The GCF of two given numbers where one of them is a prime number is either 1 or the number itself.
• GCF of two consecutive numbers is always 1.
• Given two numbers 27 and 81, such that GCF is 27 where 27 will always be less than 27 and 81.
• Product of two numbers is always equal to the product of their GCF and LCM.

#### How do you explain factors?

In mathematics, a factor is a number or also it can be an algebraic expression that divides another number or any expression completely and that too without leaving any remainder. A factor of a number can be positive or negative.

#### Properties of Factors

• Every number is a factor of zero (0), since 27 x 0 = 0 and 81 x 0 = 0.
• Every number other than 1 has at least two factors, namely the number itself and 1.
• Every factor of a number is an exact divisor of that number, example 1, 3, 9, 27 are exact divisors of 27 and 1, 3, 9, 27, 81 are exact divisors of 81.
• Factors of 27 are 1, 3, 9, 27. Each factor divides 27 without leaving a remainder.
Simlarly, factors of 81 are 1, 3, 9, 27, 81. Each factor divides 81 without leaving a remainder.

#### Steps to find Factors of 27 and 81

• Step 1. Find all the numbers that would divide 27 and 81 without leaving any remainder. Starting with the number 1 upto 13 (half of 27) and 1 upto 40 (half of 81). The number 1 and the number itself are always factors of the given number.
27 ÷ 1 : Remainder = 0
81 ÷ 1 : Remainder = 0
27 ÷ 3 : Remainder = 0
81 ÷ 3 : Remainder = 0
27 ÷ 9 : Remainder = 0
81 ÷ 9 : Remainder = 0
27 ÷ 27 : Remainder = 0
81 ÷ 27 : Remainder = 0
81 ÷ 81 : Remainder = 0

Hence, Factors of 27 are 1, 3, 9, and 27

And, Factors of 81 are 1, 3, 9, 27, and 81

#### Examples of GCF

Sammy baked 27 chocolate cookies and 81 fruit and nut cookies to package in plastic containers for her friends at college. She wants to divide the cookies into identical boxes so that each box has the same number of each kind of cookies. She wishes that each box should have greatest number of cookies possible, how many plastic boxes does she need?

Since Sammy wants to pack greatest number of cookies possible. So for calculating total number of boxes required we need to calculate the GCF of 27 and 81.
GCF of 27 and 81 is 27.

What is the difference between GCF and LCM?

Major and simple difference betwen GCF and LCM is that GCF gives you the greatest common factor while LCM finds out the least common factor possible for the given numbers.

What is the relation between LCM and GCF (Greatest Common Factor)?

GCF and LCM of two numbers can be related as GCF(27, 81) = ( 27 * 81 ) / LCM(27, 81) = 27.

What is the GCF of 27 and 81?

GCF of 27 and 81 is 27.

Ram has 27 cans of Pepsi and 81 cans of Coca Cola. He wants to create identical refreshment tables that will be organized in his house warming party. He also doesn't want to have any can left over. What is the greatest number of tables that Ram can arrange?

To find the greatest number of tables that Ram can stock we need to find the GCF of 27 and 81. Hence GCF of 27 and 81 is 27. So the number of tables that can be arranged is 27.

Rubel is creating individual servings of starters for her birthday party. He has 27 pizzas and 81 hamburgers. He wants each serving to be identical, with no left overs. Can you help Rubel in arranging the same in greatest possible way?

The greatest number of servings Rubel can create would be equal to the GCF of 27 and 81. Thus GCF of 27 and 81 is 27.

Ariel is making ready to eat meals to share with friends. She has 27 bottles of water and 81 cans of food, which she would like to distribute equally, with no left overs. What is the greatest number of boxes Ariel can make?

The greatest number of boxes Ariel can make would be equal to GCF of 27 and 81. So the GCF of 27 and 81 is 27.

Mary has 27 blue buttons and 81 white buttons. She wants to place them in identical groups without any buttons left, in the greatest way possible. Can you help Mary arranging them in groups?

Greatest possible way in which Mary can arrange them in groups would be GCF of 27 and 81. Hence, the GCF of 27 and 81 or the greatest arrangement is 27.

Kamal is making identical balloon arrangements for a party. He has 27 maroon balloons, and 81 orange balloons. He wants each arrangement tohave the same number of each color. What is the greatest number of arrangements that he can make if every balloon is used?

The greatest number of arrangements that he can make if every balloon is used would be equal to GCF of 27 and 81. So the GCF of 27 and 81 is 27.