Finding the Common Factors

What are the steps for finding the GCF of two numbers while using the ladder method.

• Find a common factor between both numbers

• Continue finding factors until the only common factor remaining is 1

• Set up your ladder

• Multiply all numbers to the left of the ladder to find the GCF

Based on the image, what is the GCF of 36 and 120?

• 223

• 7

• 12

• 360

Based on the image, what statement is true for finding GCF?

• The GCF is always right ... I say it every night.

• The GCF is on the left.

• The LCM is all of them.

• LCM stands for lost crazed monkeys!

Based on the image, what are the 2 numbers that you are finding the GCF of?

• 2, 2, & 3

• 20

• 24 & 20

• 240

Based on the image, what is the GCF of 24 & 60?

• 2, 2, 3, 2, 5

• 20

• 120

• 12

Which information is being discovered from the ladder method?

• The Simplified Ratio

• The Least Common Multiple

• The Greatest Common Factor

• The Equivalent Fraction Multipliers

Once all the common factors have been divided out using the ladder method, how do you find the Greatest Common Factor?

• Multiply all the common factors from the left side of the ladder.

• Multiply all the numbers on the outside of the ladder.

• Use the numbers at the bottom of the ladder.

• Switch the numbers at the bottom of the ladder.

Once all the common factors have been divided out using the ladder method, how do you find the Least Common Multiple?

• Multiply all the common factors from the left side of the ladder.

• Multiply all the numbers on the outside of the ladder.

• Use the numbers at the bottom of the ladder.

• Switch the numbers at the bottom of the ladder.

GCF stands for...

• great calculator festival

• giant circumference fact

• grouped calculation finder

• greatest common factor

What is a common factor of all numbers?

• 1

• 2

• 3

• 100

Tags

CCSS.4.OA.B.4