Select a hyperlink to go to the corresponding slides.

Are You Ready for Chapter 15?

Lesson 1: Multiplication Stories

Lesson 2: Equal Groups

Lesson 3: Problem-Solving Strategy: Draw a Picture

Lesson 4: Repeated Addition

Lesson 5: Arrays

Lesson 6: Division Stories

Lesson 7: Find Equal Groups

Lesson 8: Problem-Solving Investigation: Choose a Strategy

Chapter 15 Review

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I will model and create multiplication stories.

multiplication

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Use counters to model this multiplication story:

I have 3 different flavors of ice cream. There are 5 scoops of each flavor. How many scoops of ice cream are there in all?

There are 3 flavors, so there are 3 groups.

There are 5 scoops in each group.

How many scoops are there in all?

15 scoops

There are 3 bird feeders. 2 birds are on each bird feeder. How many birds are there in all?

6 birds

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I will model skip counting to find the total in equal groups.

equal groups

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10 equal groups

How many equal groups of 2 counters can you make?

1 2 3 4 5 6 8 9 107

Find the total number of counters by skip counting by twos.

20 total counters

2 4 6 8 10 12 16 18 2014

How many equal groups of 4 counters can you make?

5 equal groups

1 2 3 4 5

Find the total number of counters by skip counting by fours.

20 total counters

4 8 12 16 20

How many equal groups of 3 are there?

4 groups of 3

Skip count. Write how many hearts in all.

12 hearts

How many equal groups of 2 are there?

5 groups of 2

Skip count. Write how many suns in all.

10 suns

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I will draw a picture to solve a problem.

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What do I know?

Underline what you know.

What do I need to find?

Circle the question.

How will I solve the problem?

I will draw a picture.

Draw a picture.

5 wreaths4 pinecones per wreath

Brenda needs 20 pinecones

in all.

4 8

12 16 20

Look back.Is my answer reasonable?

Wreath Pinecones

1 4

2 8

3 12

4 16

5 20yes

Draw a picture to solve.

Teagan bought 4 bags of apples. Each bag had 4 apples in it. How many apples did Teagan buy in all?

16 apples

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I will add and multiply equal groups.

multiplication sentence

product

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How many equal groups of boxes are shown?

2 equal groups

How many boxes are in each group?

5 boxes

What repeated addition problem can we make from the picture?

5 + 5 = 10

How would you write this repeated addition problem as a multiplication sentence?

2 × 5 = 10

How many equal groups of boxes are shown?

3 equal groups

Write the repeated addition problem to show the picture.

4 + 4 + 4 = 12

Write the multiplication sentence to show the picture.

3 × 4 = 12

The first number tells how many groups there are.

3 × 4 = 12

The second number tells how many items are in each group.

3 × 4 = 12

The last number is the answer, or product.

3 × 4 = 12

Add. Then multiply.

___ + ___ + ___ = ___

___ × ___ = ___3 3 3 9

3 3 9

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I will use arrays to multiply.

array

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An array is a model for multiplication.

An array is always in what shape?

a rectangle

Use counters and the grid on the right to model 20.

What multiplication problem does the array model?

2 × 10 = 20

What is another way to model 20 on the grid?

What multiplication problem does the array model?

10 × 2 = 20

What is another way to model 20 on the grid?

What multiplication problem does the array model?

5 × 4 = 20

4 × 5 = 20

What is another way to model 20 on the grid?

What multiplication problem does the array model?

Write the multiplication sentence for the array.

3 × 4 = 12

Write the multiplication sentence for the array.

4 × 3 = 12

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I will model and create division stories.

division

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Use counters to model this division story:

Benjamin picked 25 apples. He has 5 baskets. How many apples can Benjamin put in each basket so that each basket has the same number of apples?

There are 25 counters to represent 25 apples.

There are 5 sections to represent 5 baskets.

Divide the apples evenly among the baskets.

How many apples are in each basket? 5 apples

Model using marbles to solve. Draw a picture to show your work.

4 friends share 8 apples.

Each friend gets 2 apples.

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I will divide to make equal groups.

division sentence

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You have 12 flowers and 3 vases. You want to put an equal number of flowers in each vase.

How many flowers are there?

12

How many groups do we need to make?

3

How many flowers go in each vase to make the equal groups?

Write a division sentence to model the problem.

12 ÷ 3 = 4

There are 20 counters and 4 equal groups. How many are in each group?

5 counters in each group

Write a division sentence to show the problem.

20 ÷ 4 = 5

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I will choose a strategy to solve a problem.

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What do I know?

Underline what you know.

What do I need to find?

Circle the question.

How will I solve the problem?

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One way is to draw a picture.

1 3 5

2 4 6

Me

TaliaEach girl will

get 3 bracelets.

Is my answer reasonable?

yes; 3 + 3 = 6

1 3 5

2 4 6

Me

Talia

Choose a strategy. Solve.

A touchdown is worth 6 points. 3 touchdowns were scored in one game. How many points in all were scored by touchdowns?

18 points

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The ____________ is the answer to a multiplication problem.

An ____________ is objects displayed in rows and columns.

array product

Complete the sentences.

product

array

3 × 2 = __

4 × 4 = __

3 × 3 = __

10 ÷ 2 = __

9 ÷ 3 = __

15 ÷ 3 = __

6

16

9

5

3

5

Solve.

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