2x2 Multiplication

Let’s Learn!

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I can solve one-step word problems

involving multiplication of two digit by two digit

numbers using various algorithms.

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Let’s review our vocabulary:

Factor

Product

Distributive Property

Equation

Image created by HISD Curriculum using Microsoft PowerPoint

Image created by HISD Curriculum using Microsoft PowerPoint

Image created by HISD Curriculum using Microsoft PowerPoint

Image created by HISD Curriculum using Microsoft PowerPoint

Created by HISD Curriculum using Google Slides

To present a multiplication or
division word problem, we can use
the G.E.T. strategy to understand
the information given.

Complete the following:
1.

Review the anchor chart.

2.

Write it in your math journal.

3.

Be ready to use the strategy
throughout our lesson.

Review: G.E.T. Strategy

G.E.T. Strategy

G:number of Groups

E: number of items in Each group

T: Total number of items

Match

Jacob unpacked 21 boxes of baseball cards to display in a sports store. Each box had 34 cards. How many cards did Jacob unpack?

• G

  (Number of Groups)

• E

  (Number of items in Each group)

• T

  (Total number of Items

21

34

?

• 21

• 34

• ?

Multiple Choice

Jacob unpacked 21 boxes of baseball cards to display in a sports store. Each box had 34 cards. How many cards did Jacob unpack?

Which expression could be used to solve this problem?

• 21 + 34

• 21 - 34

• 21 x 34

• 21 ÷ 34

What is our group?
G: 21 boxes

What is the amount in each group?
E: 34 cards

What is our total?
T: ? cards

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Read the word problem and the questions below.

Jacob unpacked 21 boxes of baseball cards to display in a sports
store. Each box had 34 cards. How many cards did Jacob unpack?

Equation: 21 x 34 =

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Let’s use base ten blocks to represent 21 x 34.

Step 1:Build
the frame and
write the
values.

21

34

Base-Ten Blocks by HISD Curriculum using 1,2,3 Math Fonts

Created by HISD Curriculum using Google Slides

Let’s use base ten blocks to represent 21 x 34.

Step 2:
Multiply:
10 x 10 = 100
10 x 1 = 10
1 x 1 = 1

10

10

1

10

10

10

11 1 1

Base-Ten Blocks by HISD Curriculum using 1,2,3 Math Fonts

Created by HISD Curriculum using Google Slides

Let’s use base ten blocks to represent 21 x 34.

10

10

1

10

10

10

11 1 1

Step 3:
Find the product:
6 x 100 = 600
11 x 10 = 110
4 x 1 = 4
714

Base-Ten Blocks by HISD Curriculum using 1,2,3 Math Fonts

Created by HISD Curriculum using Google Slides

Now, let’s use partial product strategy to solve 21 x 34.

Jacob unpacked 21 boxes of baseball cards to display in a sports
store. Each box had 34 cards. How many cards did Jacob unpack?

When we use partial products, we can multiply 21 x 34 by
decomposing each number. Then, add the numbers to find
the product.

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Created by HISD Curriculum using Google Slides

Jacob unpacked 21 boxes of baseball cards to display in a sports
store. Each box had 34 cards. How many cards did Jacob unpack?

Image created by HISD Curriculum using Microsoft Word

Let’s connect the partial product strategy to the distributive
property strategy.

Partial Products:

Distributive Property:

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Jacob unpacked 714 baseball cards.

We can see the connection between partial product
and the distributive property strategy, when we
multiplied 21 x 34. Both strategies decompose one of
the factors to make it easier to multiply.

Your Turn!

Go to “Let’s Practice.”

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Multiple Choice

51 x 12

• 512

• 163

• 882

• 612

Click HERE