How do you find all the factor pairs of a number?

For example:Find all the factors pairs of 12

In this lesson you will learn how to find all the factor pairs of a number by using a T-Chart

Let’s Review

What’s a Factor?A factor is whole numbers that

multiplies with another factor to get whole number product.

2 x 3 = 6Factors Product

Let’s Review

A factor is a whole number that evenly divides into another number.

6÷2 =3

FactorsProduct

7÷2 =3 R 1

Let’s Review

Commutative Property: A x B= B x A

2 x 3 = 63 x 2 = 6

A Common Mistake

When listing factor pairs, don’t forget to list the number as a factor of itself.

6= 1x6

Core Lesson

Find all the factor pairs for 6

Factors

product6

1 x 6

2 x 3

Core Lesson

Find all the factor pairs for 12

12 1 x 12

2 x 6

3 x 4

In this lesson you have learned how to find all the factor pairs

of a number by using a T-chart.

Guided Practice

Find all the factor pairs of 30

30

1 x 30 2 x 15 3 x 10 5 x 6

Extension Activities

Find the factor pairs for 15.

Extension Activities

A new chocolate bar is being designed. What rectangular shapes can they make if the bar has 50 squares? (Find the factor pairs for 50.)

Extension Activities

Find all the possible chocolate bar dimensions for a bar with 62 squares. List the dimensions as pairs, then in numerical order from least to greatest.

Extension Activities

GAME: “Factors For It”Use playing cards with the Kings, Queens, and Jacks removed. Two players play at a time. Scratch paper or white boards and pens are needed. Aces =1

Directions: 1. Place the cards in a single stack in the center. 2. Flip two cards over.3. The players multiply the two factors (cards) together to get

the product of the two cards. (2 & a 5= 2x5=10)4. Then the players use their paper or white boards to list ALL

of the factor pairs that make up that product.5. Winner must have all the factors written down. Winner

keeps both cards, a ‘draw’ leaves the cards, the winner of the next turn gets these cards as well.

Quick Quiz

Find all the factor pairs for 16.

Find the factor pairs for 28.