GCF and LCM Review

What is a factor tree?

• a factor tree shows the division process until you reach prime factorisation

• a factor tree shows all the pairs of factors that a number has

• a factor tree show how many times you can divide by 2

Is this factor tree complete?

• Yes because 8*9 = 72

• No, because 8 can still be divided by 2

• No because 9 can still be divided by 3,

How would you complete this factor tree?

• 8 = 2*2*2 and 9 = 3*3

• 8 = 2*4 and 9 = 3*3

• It already is complete

What is the missing factor?

• 1

• 2

• 5

• 8

What are the missing factors?

• 2 and 3

• 3 and 6

• 3 and 3

• 1 and 9

What factors do these numbers (16 and 24) have in common?

• 2

• 3

• 2 and 2

• 2, 2, and 2

What is a factor tree?

• A factor tree is a diagram used to find the prime factors of a number.

• A factor tree is a diagram used to find the square root of a number.

• A factor tree is a diagram used to find the multiples of a number.

• A factor tree is a diagram used to find the composite factors of a number.

What is GCF Greatest Common Factor between two numbers? Only one answer is correct.

• GCF is the biggest/greatest number that can divide/factor both numbers.

• GCF is the product of your two numbers

• GCF is the smallest prime number that divides both numbers.

What is LCM Least Common Multiple between two numbers? Only one answer is correct.

• LCM is the biggest/greatest number that can divide/factor both numbers.

• LCM is the product of your two numbers divided by your GCF

• LCM is the smallest prime number that divides both numbers.

What is the GCF of 18 and 24?

• 3

• 6

• 8

• 9