Factors and Common Rods Concepts

The video tutorial explains how to determine the factors of the numbers eight and twelve, and how to find their greatest common factor (GCF) using a visual tool called a fraction wall or rods. It begins by defining factors and the GCF, then demonstrates how to use rods to find all factors of eight and twelve. The tutorial concludes by identifying the GCF of eight and twelve as four, using the largest common rod. This method provides a visual and practical approach to understanding factors and the GCF.

What is a factor of a whole number?

• A number that is less than the whole number

• A number that is a multiple of the whole number

• A number that divides evenly into the whole number

• A number that is greater than the whole number

What is the greatest common factor (GCF)?

• The smallest factor of a number

• The product of all factors of a number

• The sum of all factors of a number

• The largest factor that divides two or more numbers

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CCSS.3.NF.A.2B

What is the purpose of using a fraction wall?

• To find the sum of numbers

• To identify the greatest number

• To determine factors using rods

• To multiply numbers

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CCSS.2.OA.A.1

Which rods can form a train of length eight?

• Two, four rods

• Three, six rods

• Five, one rods

• Seven, two rods

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What are the factors of eight?

• Two, three, six, eight

• Two, four, six, eight

• One, three, five, eight

• One, two, four, eight

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Which rods can form a train of length twelve?

• Five, eight rods

• Two, six rods

• Three, five rods

• Four, seven rods

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CCSS.4.OA.B.4

What are the factors of twelve?

• One, two, three, four, six, twelve

• Two, four, six, eight, ten, twelve

• Two, three, five, seven, eleven, twelve

• One, three, five, seven, nine, twelve

What is the greatest common factor of eight and twelve?

• Three

• Two

• Four

• Six

Which rod is the largest common rod for eight and twelve?

• Two rod

• Three rod

• Six rod

• Four rod

How can the greatest common factor be visually identified using rods?

• By counting the number of rods

• By finding the largest rod they have in common

• By adding the lengths of all rods

• By finding the smallest rod