Finding GCF and LCM with the Birthday Cake Method

The video tutorial demonstrates the birthday cakes method to find the greatest common factor (GCF) and least common multiple (LCM) of two numbers, 16 and 24. The method involves identifying prime numbers, creating layers of a 'cake' with these factors, and using the 'icing' and 'cake topper' to calculate the GCF and LCM. The process is broken down into steps, including finding prime factors, building layers, and performing calculations to determine the GCF and LCM.

What method is being demonstrated in the video?

• Birthday cakes method

• Prime factorization method

• Division method

• Subtraction method

Which numbers are used in the example?

• 14 and 28

• 16 and 24

• 12 and 18

• 20 and 30

What is the first prime number used to divide 16 and 24?

• 2

• 7

• 5

• 3

Tags

CCSS.5.NF.B.7A

CCSS.5.NF.B.7C

What are the results of dividing 16 and 24 by 2?

• 10 and 15

• 2 and 3

• 4 and 6

• 8 and 12

Tags

CCSS.4.NBT.B.6

CCSS.5.NBT.B.6

After dividing by 2 again, what are the new numbers?

• 8 and 12

• 4 and 6

• 2 and 3

• 10 and 15

Tags

CCSS.4.NBT.B.6

CCSS.5.NBT.B.6

What is the cake topper in the example?

• 4

• 6

• 2

• 3

Tags

CCSS.1.OA.A.1

How is the greatest common factor (GCF) calculated?

• By dividing the numbers in the icing

• By subtracting the numbers in the icing

• By multiplying the numbers in the icing

• By adding the numbers in the icing

What is the GCF of 16 and 24?

• 8

• 6

• 4

• 12

How is the least common multiple (LCM) calculated?

• By multiplying the numbers in the icing and cake topper

• By dividing the numbers in the icing and cake topper

• By subtracting the numbers in the icing and cake topper

• By adding the numbers in the icing and cake topper

What is the LCM of 16 and 24?

• 32

• 40

• 48

• 56