# What is GCF of 30 and 40?

GCF of 30 and 40 is 10

#### How to find GCF of two numbers

 1.   Steps to find GCF of 30 and 40 2.   What is GCF of two numbers? 3.   What are Factors? 4.   Examples of GCF

### Example: Find gcf of 30 and 40

• Factors for 30: 1, 2, 3, 5, 6, 10, 15, 30
• Factors for 40: 1, 2, 4, 5, 8, 10, 20, 40

Hence, GCf of 30 and 40 is 10

#### Definition of GCF

Greatest common factor commonly known as GCF of the two numbers is the highest possible number which completely divides given numbers, i.e. without leaving any remainder. It is represented as GCF (30, 40).

#### Properties of GCF

• Given two numbers 30 and 40, such that GCF is 10 where 10 will always be less than 30 and 40.
• GCF of two numbers is always equal to 1 in case given numbers are consecutive.
• The product of GCF and LCM of two given numbers is equal to the product of two numbers.
• The GCF of two given numbers is either 1 or the number itself if one of them is a prime number.

#### What are factors?

In mathematics, a factor is that number which divides into another number exactly, without leaving a remainder. A factor of a number can be positive or negative.

#### Properties of Factors

• Each number is a factor of itself. Eg. 30 and 40 are factors of themselves respectively.
• 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, 2, 3, 5, 6, 10, 15, 30 are exact divisors of 30 and 1, 2, 4, 5, 8, 10, 20, 40 are exact divisors of 40.
• 1 is a factor of every number. Eg. 1 is a factor of 30 and also of 40.
• Every number is a factor of zero (0), since 30 x 0 = 0 and 40 x 0 = 0.

#### Steps to find Factors of 30 and 40

• Step 1. Find all the numbers that would divide 30 and 40 without leaving any remainder. Starting with the number 1 upto 15 (half of 30) and 1 upto 20 (half of 40). The number 1 and the number itself are always factors of the given number.
30 ÷ 1 : Remainder = 0
40 ÷ 1 : Remainder = 0
30 ÷ 2 : Remainder = 0
40 ÷ 2 : Remainder = 0
30 ÷ 3 : Remainder = 0
40 ÷ 4 : Remainder = 0
30 ÷ 5 : Remainder = 0
40 ÷ 5 : Remainder = 0
30 ÷ 6 : Remainder = 0
40 ÷ 8 : Remainder = 0
30 ÷ 10 : Remainder = 0
40 ÷ 10 : Remainder = 0
30 ÷ 15 : Remainder = 0
40 ÷ 20 : Remainder = 0
30 ÷ 30 : Remainder = 0
40 ÷ 40 : Remainder = 0

Hence, Factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30

And, Factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40

#### Examples of GCF

Sammy baked 30 chocolate cookies and 40 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 30 and 40.
GCF of 30 and 40 is 10.

A class has 30 boys and 40 girls. A choir teacher wants to form a choir team from this class such that the students are standing in equal rows also girls or boys will be in each row. Teacher wants to know the greatest number of students that could be in each row, can you help him?

To find the greatest number of students that could be in each row, we need to find the GCF of 30 and 40. Hence, GCF of 30 and 40 is 10.

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.

Ram has 30 cans of Pepsi and 40 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 30 and 40. Hence GCF of 30 and 40 is 10. So the number of tables that can be arranged is 10.

Ariel is making ready to eat meals to share with friends. She has 30 bottles of water and 40 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 30 and 40. So the GCF of 30 and 40 is 10.

Mary has 30 blue buttons and 40 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 30 and 40. Hence, the GCF of 30 and 40 or the greatest arrangement is 10.

Kamal is making identical balloon arrangements for a party. He has 30 maroon balloons, and 40 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 30 and 40. So the GCF of 30 and 40 is 10.

Kunal is making baskets full of nuts and dried fruits. He has 30 bags of nuts and 40 bags of dried fruits. He wants each basket to be identical, containing the same combination of bags of nuts and bags of driesn fruits, with no left overs. What is the greatest number of baskets that Kunal can make?

the greatest number of baskets that Kunal can make would be equal to GCF of 30 and 40. So the GCF of 30 and 40 is 10.

To energize public transportation, Abir needs to give a few companions envelopes with transport tickets, and metro tickets in them. On the off chance that he has 30 bus tickets and 40 metro tickets to be parted similarly among the envelopes, and he need no tickets left. What is the greatest number of envelopes Abir can make?

To make the greatest number of envelopes Abir needs to find out the GCF of 30 and 40. Hence, GCF of 30 and 40 is 10.