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 (90, 120).
Properties of GCF
- Given two numbers 90 and 120, such that GCF is 30 where 30 will always be less than 90 and 120.
- 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. 90 and 120 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, 9, 10, 15, 18, 30, 45, 90 are exact divisors of 90 and 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120 are exact divisors of 120.
- 1 is a factor of every number. Eg. 1 is a factor of 90 and also of 120.
- Every number is a factor of zero (0), since 90 x 0 = 0 and 120 x 0 = 0.
Steps to find Factors of 90 and 120
- Step 1. Find all the numbers that would divide 90 and 120 without leaving any remainder. Starting with the number 1 upto 45 (half of 90) and 1 upto 60 (half of 120). The number 1 and the number itself are always factors of the given number.
90 ÷ 1 : Remainder = 0
120 ÷ 1 : Remainder = 0
90 ÷ 2 : Remainder = 0
120 ÷ 2 : Remainder = 0
90 ÷ 3 : Remainder = 0
120 ÷ 3 : Remainder = 0
90 ÷ 5 : Remainder = 0
120 ÷ 4 : Remainder = 0
90 ÷ 6 : Remainder = 0
120 ÷ 5 : Remainder = 0
90 ÷ 9 : Remainder = 0
120 ÷ 6 : Remainder = 0
90 ÷ 10 : Remainder = 0
120 ÷ 8 : Remainder = 0
90 ÷ 15 : Remainder = 0
120 ÷ 10 : Remainder = 0
90 ÷ 18 : Remainder = 0
120 ÷ 12 : Remainder = 0
90 ÷ 30 : Remainder = 0
120 ÷ 15 : Remainder = 0
90 ÷ 45 : Remainder = 0
120 ÷ 20 : Remainder = 0
90 ÷ 90 : Remainder = 0
120 ÷ 24 : Remainder = 0
120 ÷ 120 : Remainder = 0
Hence, Factors of
90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90
And, Factors of
120 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120
Examples of GCF
Sammy baked 90 chocolate cookies and 120 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 90 and 120.
GCF of 90 and 120 is 30.
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(90, 120) = ( 90 * 120 ) / LCM(90, 120) = 30.
What is the GCF of 90 and 120?GCF of 90 and 120 is 30.
Ram has 90 cans of Pepsi and 120 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 90 and 120. Hence GCF of 90 and 120 is 30. So the number of tables that can be arranged is 30.
Rubel is creating individual servings of starters for her birthday party. He has 90 pizzas and 120 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 90 and 120. Thus GCF of 90 and 120 is 30.
Ariel is making ready to eat meals to share with friends. She has 90 bottles of water and 120 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 90 and 120. So the GCF of 90 and 120 is 30.
Mary has 90 blue buttons and 120 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 90 and 120. Hence, the GCF of 90 and 120 or the greatest arrangement is 30.
Kamal is making identical balloon arrangements for a party. He has 90 maroon balloons, and 120 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 90 and 120. So the GCF of 90 and 120 is 30.