Lesson 15: I can solve two-step word problems involving measurement and multi-digit multiplication.

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Lesson 15: I can solve two-step word problems involving measurement and multi-digit multiplication. Time to Sprint!. 2.D.30 &amp; 2.D.31. Get Your White Board Ready!. Write as a three-step Division Sentence. 480 ÷ 20 =____. 480 ÷ 10 ÷ 2. 48. 2. ÷. 24. =. 480 ÷ 20 =____. 24.

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### Lesson 15: I can solve two-step word problems involving measurement and multi-digit multiplication.

5th Grade Module 2 – Lesson 15

Time to Sprint!

2.D.30 & 2.D.31

5th Grade Module 2 – Lesson 15

Write as a three-step Division Sentence

480 ÷ 20 =____

480 ÷ 10 ÷ 2

48

2

÷

24

=

480 ÷ 20 =____

24

5th Grade Module 2 – Lesson 15

Write as a three-step Division Sentence

690 ÷ 300 =____

690 ÷ 100 ÷ 3

6.9

3

÷

2.3

=

690 ÷ 300 =____

2.3

5th Grade Module 2 – Lesson 15

Write as a three-step Division Sentence

8,480 ÷ 400 =____

8480 ÷ 100 ÷ 4

84.8

4

÷

21.2

=

8,480 ÷ 400 =____

21.2

5th Grade Module 2 – Lesson 15

Write as a three-step Division Sentence

6,480 ÷ 20 =____

6480 ÷ 10 ÷ 2

648

2

÷

324

=

6,480 ÷ 20 =____

324

5th Grade Module 2 – Lesson 15

Concept Development

For this lesson we will be completing some of the problems from the problem set together. Take out the Problem Set on pages 2.D.32 – 2.D.34.

Let’s Solve Problem Number 1 together.

Liza’s cat had six kittens! When Liza and her brother weigh all the kittens together, they weigh 4 pounds 2 ounces. Since all the kittens are about the same size, how many ounces does each kitten weigh?

4 lb 2 oz

I can draw 6 units representing 6 kittens

Let’s read the first sentence and draw a diagram to match what it says.

What is the important information and how can we show that in our drawing?

Let’s label the total weight for all 6 kittens as 4 lb 2 oz.

Wait! Isn’t it easier to have only one unit?? Let’s write an equation to convert our total weight into ounces first.

Have we answered the question in the problem yet?

Let’s read the question. What are we trying to find out? Where should we put our ? on the diagram?

Okay so how do we solve to find the weight of one kitten?

NO!!

Let’s divide the 66 oz by 6.

Work with your partner to convert 4 lb 2 oz into ounces. Remember there are 16 oz in 1 pound.

Yes! We will divide the total weight by 6.

?

66 ÷ 6 = 11

1 unit = 11 oz.

Each kitten weighs 11 ounces.

66

4 lb 2 oz = ______ oz.

5th Grade Module 2 – Lesson 15

Problem 2

Holly is buying orange juice for the class party. There are 24 people coming, and she figures each person will drink 1.75 cups.

a. How many fluid ounces of juice will she need?

1.75 c x 24 =

42 cups

Convert 42 cups to ____ fluid ounces

Big to Small (multiply)

42 x 8 =

336 fl oz.

Since we need to find out how many total OUNCES she will need, we need to convert the cups into ounces.

We can either convert first our after finding the total amount of cups.

Let’s draw a tape diagram with 24 units but use dot, dot, dot to represent a total of 24. How much would each unit equal?

Read the problem and decide with your partner what you can draw.

Is this a one-step or multi-step problem?

Turn & Talk

Let’s first find out how many total cups Holly needs.

Calculate the total cups with your partner.

?

1 2 3 ………… 24

5th Grade Module 2 – Lesson 15

Problem 2

Holly is buying orange juice for the class party. There are 24 people coming, and she figures each person will drink 1.75 cups.

b. If she buys five 59-ounce containers, will she have enough juice?

Yes! We need to find out how many ounces are in

five 59-ounce containers. Solve that on your own.

What do we need to do first in order to solve this?

Turn & Talk

Will she have enough juice?

5 x 59 ounces =

295 fl. ounces

No, she does not have enough juice because 295 fluid ounces is less than 336 fluid ounces.

Without calculating can we answer Part (b)? Turn & Talk

5th Grade Module 2 – Lesson 15

Complete Pages 2.D.32 – 2.D.34

You will have 20minutes to work.

5th Grade Module 2 – Lesson 15

LET’S Debrief

• Look back at Problem 4(b). Would it have been possible to answer Part (b) prior to answering Part (a)? Did you need to convert to pounds first and then subtract or was there another way to solve?
• Look back at Problem 6. Explain your thinking as you solved. What steps did you take to find the solution?
• Explain to your partner why we multiply when converting from large units to smaller ones. What would we do when converting from smaller units to larger ones? Why?

5th Grade Module 2 – Lesson 15

EXIT

TICKET

Page 2.D.35

5th Grade Module 2 – Lesson 15