3.4G 2x1 Multiplication

Created by HISD Curriculum using Google® Slides

I can represent and solve multiplication
word problems involving 2-digit x 1-digit

using the standard algorithm.

Let’s Learn!

Let’s review our vocabulary.

Factor

Numbers that are multiplied
together to find a product.

2 x 3 = 6

Product

The total when two or more
factors are multiplied.

2 x 3 = 6

Equal Groups

Groups that have the same amount
in each.

factor

factor

product

Arrays

A group of objects or pictures in
rows and columns.

rows

columns

Partial Product

A method used to multiply numbers
by decomposing factors based on
place value.

30

6

10

2

x

3

30 + 6 = 36

Match

Match the following

• Factor

• Product

• Partial Product

• Equal Groups

• Arrays

Numbers that are multiplied together to find a product.

The total when two or more factors are multiplied.

A method used to multiply numbers by decomposing factors based on place value.

Groups that have the same amount in each.

A group of objects or pictures in rows and columns.

• Numbers that are multiplied together to find a product.

• The total when two or more factors are multiplied.

• A method used to multiply numbers by decomposing factors based on place value.

• Groups that have the same amount in each.

• A group of objects or pictures in rows and columns.

Created by HISD Curriculum using Google Slides

When presented with a math story,
we want to read the problem 3
times to focus on comprehending
the information provided to us.
Complete the following:

1. Review the anchor chart in your

math journal.

2. Be ready to use the strategy

throughout our lesson.

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Review: 3 Reads Strategy

Guiding Question: How can I use the standard algorithm to
solve 2-digit x 1-digit multiplication word problems?

Created by HISD Curriculum using Google® Slides

Let’s look at the math story.

Benita is making flower arrangements for a party.

She made 28 flower arrangements. Each

arrangement had 6 roses. How many roses did

Benita use?

Answer the following questions in your math journal.

●What is happening in this problem?

●What is known?

●What is unknown?

●What is the unit/label for the problem?

●How can we use a model to represent the expression 28 x 6?

Created by HISD Curriculum using Google® Slides

Did you answer the questions the same way?

What is happening in this problem?Benita made flower arrangements.

What is known?She made 28 flower arrangements. Each arrangement had 6
roses.

What is unknown?How many roses did Benita use?

What is the unit/label for the problem?Roses

How can we make a model to represent the expression 28 x 6?We can
use partial products.

Use partial products to answer the solve the problem.

Multiple Choice

Benita is making flower arrangements for a party. She made 28 flower arrangements. Each arrangement had 6 roses. How many roses did Benita use?

Which expression could be used to represent the problem?

• 28 + 6

• 28 - 6

• 28 x 6

• 28 / 6

Draw

Draw different ways to represent the problem. (i.e. area model, base 10 blocks, equal groups.

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Look at these ways to solve the problem.

120

48

20

8

+

6

120 + 48 = 168

120

30

18

6

20

+

+5

3

120 + 30 + 18 = 168

60

60

48

6

10

+

+

10

8

60 + 60 + 48 = 168

120

24

24

6

20

+

+4

4

120 + 24 + 24 = 168

S

Created by HISD Curriculum using Google® Slides

Let’s connect partial products to the alternative
algorithm.

28
x 6

48 (6 x 8)

+ 120 (6 x 20)

168

Partial Product

120

48

20

8

+

6

120 + 48 = 168

Alternative Algorithm

How can we move from the alternative algorithm to standard algorithm?

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Let’s connect partial products to the alternative
algorithm.

28
x 6

+4

168
6 times 8 is 48.
Leave the 8 ones in the ones place.
Regroup the 4 tens to the tens place.

6 times 2 tens is 12 tens.
12 tens plus 4 tens is 16 tens.
16 tens is the same as 160.
160 and 8 ones is the same as 168.

28
x 6

48 (6 x 8)

+ 120 (6 x 20)

168

Benita used 168 roses.

Benita is making flower arrangements for a party. She made 28 flower
arrangements. Each arrangement had 6 roses. How many roses did Benita

use?

Created by HISD Curriculum using Google® Slides

Your Turn!

Go to Let’s Practice next.

Multiple Choice

A baseball leauge bought 9 boxes of baseballs. Each box contained 36 baseball cards. How many baseball cards did the league buy?

• 324

• 274

• 84

• 34

Multiple Choice

Stacy made 7 bows. She used 3 feet of ribbon for each bow.

Which equation can be used to find the amount of ribbon Stacy used?

• 7 x 3 = 21

• 7 + 3 = 10

• 7 - 3 = 4

• 7 / 3 = 4

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