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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.

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Presentation on theme: "Lesson 15: I can solve two-step word problems involving measurement and multi-digit multiplication. 5th Grade Module 2 – Lesson 15."— Presentation transcript:

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2 Lesson 15: I can solve two-step word problems involving measurement and multi-digit multiplication. 5th Grade Module 2 – Lesson 15

3 Time to Sprint! 2.D.30 & 2.D.31 5th Grade Module 2 – Lesson 15

4 Get Your White Board Ready! 5th Grade Module 2 – Lesson ÷ 20 =____ Write as a three-step Division Sentence 480 ÷ 10 ÷ ÷ = ÷ 20 =____ 24

5 Get Your White Board Ready! 5th Grade Module 2 – Lesson ÷ 300 =____ Write as a three-step Division Sentence 690 ÷ 100 ÷ ÷ = ÷ 300 =____ 2.3

6 Get Your White Board Ready! 5th Grade Module 2 – Lesson 15 8,480 ÷ 400 =____ Write as a three-step Division Sentence 8480 ÷ 100 ÷ ÷ = ,480 ÷ 400 =____ 21.2

7 Get Your White Board Ready! 5th Grade Module 2 – Lesson 15 6,480 ÷ 20 =____ Write as a three-step Division Sentence 6480 ÷ 10 ÷ ÷ = 324 6,480 ÷ 20 =____ 324

8 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? Let’s read the first sentence and draw a diagram to match what it says. I can draw 6 units representing 6 kittens Read the next sentence. What is the important information and how can we show that in our drawing? Read the next sentence. 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. 4 lb 2 oz Let’s read the question. What are we trying to find out? Where should we put our ? on the diagram? 4 lb 2 oz = ______ oz. ? Okay so how do we solve to find the weight of one kitten? Yes! We will divide the total weight by 6. Wait! Isn’t it easier to have only one unit?? Let’s write an equation to convert our total weight into ounces first. Work with your partner to convert 4 lb 2 oz into ounces. Remember there are 16 oz in 1 pound. 66 Have we answered the question in the problem yet? NO!! Let’s divide the 66 oz by 6. Work with your partner. Express your answer as a sentence. NO!! Let’s divide the 66 oz by 6. Work with your partner. Express your answer as a sentence. 66 ÷ 6 = 11 1 unit = 11 oz. Each kitten weighs 11 ounces.

9 Problem 2 5th Grade Module 2 – Lesson 15 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? Read the problem and decide with your partner what you can draw. (think about using “…” ) Read the problem and decide with your partner what you can draw. (think about using “…” ) 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? 1.75 c ………1.75 c 1 2 3…………24 Go ahead and try to draw and label your diagram. Re-read Part (a) with your partner. What is Part (a) asking? Is this a one-step or multi-step problem? Turn & Talk 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 first find out how many total cups Holly needs. Calculate the total cups with your partner. ? 1.75 c x 24 = 42 cups Convert 42 cups to ____ fluid ounces Big to Small (multiply) 42 x 8 = 336 fl oz.

10 5th Grade Module 2 – Lesson 15 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? Problem 2 Let’s read Part (b) together.What do we need to do first in order to solve this? Turn & Talk Yes! We need to find out how many ounces are in five 59-ounce containers. Solve that on your own. Yes! We need to find out how many ounces are in five 59-ounce containers. Solve that on your own. 5 x 59 ounces = 295 fl. ounces 5 x 59 ounces = 295 fl. ounces Without calculating can we answer Part (b)? Turn & Talk No, she does not have enough juice because 295 fluid ounces is less than 336 fluid ounces. No, she does not have enough juice because 295 fluid ounces is less than 336 fluid ounces. Will she have enough juice?

11 Get Ready to Complete the Problem Set on Your Own! Complete Pages 2.D.32 – 2.D.34 You will have 20 minutes to work. Try your Best! 5th Grade Module 2 – Lesson 15

12 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?

13 5th Grade Module 2 – Lesson 15 EXIT TICKET Page 2.D.35


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