Multiply by 7 8 9

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SESSION 5
Refine
Multiplying with 7, 8, and 9

Learning Targets
• Multiply with 7, 8, and 9.
• Break apart a factor or an array to help multiply.
• Change the order of factors to help multiply.

LESSON 7 • Multiply with 7, 8, and 9

© Curriculum Associates, LLC. All rights reserved.

Subject to CA’s Terms of Use for Teacher Toolbox Materials.

Hello Teachers!
Not in the mood for the
Refine lesson?
Check out Slides 25-28 for
a partner activity and
independent practice
page.

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Start

Fill in the blanks to show a
way to break apart 6 9.
Then solve.
6 ( + )
(6 ) + (6 )
So, 6 9 = .

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CONNECT TO CULTURE Optional

Abula is a ball game played in Nigeria.
Similar to volleyball, abula is played on a
court with a large net that separates the
two teams. Each team uses a rectangular
wooden bat with two holes to hit the ball
over the net.

• What sports do you enjoy watching or

playing?

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Example

EXAMPLE

There are 7 teams at an abula meet. Each
team has 8 players. How many players are
at the meet?

Look at how you could show your work using
an array.

Solution

The student broke apart
the 8 and added the
products together.

Could you break apart
the 7 to solve this
problem?

177

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CONNECT TO CULTURE Optional

Sometimes farmers keep hay in
silos. Some farmers might
harvest plants, such as alfalfa
and corn, place the plants in a pit
or pile, and then put a tarp or
plastic cover over it.

• Why do you think it is

important for farmers to store
food for their animals?

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Troy puts tires over plastic that covers a pile of
animal feed. He puts 8 rows of 9 tires. How
many tires does Troy put on the plastic? Show
how to break apart one of the numbers to
make the problem easier to solve.

Solution

You can break apart the
number 9 many different
ways.

How did you and your
partner decide how to
break apart one of the
numbers?

177

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Taka is not sure how to find 5 8. He tells you
that he knows the multiplication facts for 5, so
he knows 8 5. Show how Taka can use
8 5 to find 5 8. Show your work.

Solution

Do you have to break
apart the factor 8 to use
multiplication facts for 5?

How could you have
broken apart 8?

178

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Latoya finds 9 7 by breaking apart the 7 into
3 and 4. Which of the following expressions
does Latoya use?

(9 5) + (9 2)

(4 7) + (5 7)

(9 3) + (9 4)

(7 3) + (7 4)

Ahmed chose as the correct answer. How
did he get that answer?

Latoya broke apart
the 7. What will she do
with the 9?

Will Ahmed and Latoya
get the same answer?

178

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Jayden finds 5 7 by breaking it apart as
shown below.

(3 7) + ( ____ 7)

What number belongs in the blank?

1

2

4

8

179

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Cruz has 5 packs of pencils. There are 8 pencils
in each pack. He wants to know how many
pencils they have in all. The model below shows
how he breaks apart one number in the problem.

Which expression shows how Cruz solves
the problem?

(2 8) + (3 8)

(5 3) + (5 5)

(2 5) + (3 5)

(2 8) + (2 8)

179

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Use the array shown to find 8 8. First, draw
circles to break the array into two groups.
Then fill in the blanks to show how you broke
the array apart.

8 8 = 8 ( + )

= (8 ) + (8 )

=

+

=

180

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Is each expression equivalent to the product of
6 and 9?

Yes

No

(6 3) + (6 3)

(6 4) + (6 5)

6 (6 + 3)

9 (2 + 4)

(3 9) + (3 9)

180

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Close: Exit Ticket

There are 9 rows in Mrs. Panzo’s rooftop
garden. Each row has 9 plants in it. How many
plants are in the garden? Use an equation to
show one way to break apart one of the factors
and solve the problem. Explain your thinking.

180