1. Module 1 Lesson 5

2. Group Counting

3. Divide equal groups How many groups are there? How many are there in Each group? Say the total as a repeated addition sentence. Write a division sentence for 10 divided into 2 equal groups.

4. Divide equal groups How many groups are there? How many are there in Each group? Say the total as a repeated addition sentence. Write a division sentence for 8 divided into 4 equal groups.

5. Problem of the Day

6. Before we start

7. Concept Development : Problem 1: Next weekend, my friend Christy is having a party. Eighteen people are coming. I told her I’d help her set up tables. We know that 6 people can sit at each table, but we’re not sure how many tables we’ll need. Turn and talk to a partner – what information do Christy and I already have? So we know the size of the groups (6) And the total amount of people coming. What information DON’T we know? We don’t know the number of tables we will need. Tables are like groups – we don’t know how many groups we will need.

8. Next weekend, my friend Christy is having a party. Eighteen people are coming. I told her I’d help her set up tables. We know that 6 people can sit at each table, but we’re not sure how many tables we’ll need. Let’s use counters to show the problem and check our thinking. Each of you has 18 counters, 1 for each person coming to the party. Put them into groups of 6. Thumbs up when you’re done. Do you still agree we know the total and the size of each group? What else did we find out? Did we answer our question? How many tables we will need?

9. 18 ÷ 6 = 3 How does this number sentence relate to the problem we just solved? POSSIBLE ANSWERS: It shows that we divided. We knew the total, 18 people. We divided them into groups with 6 people. Then, we figured out that meant 3 groups of people. We divided the total by the size of the group and found the number of groups. Next weekend, my friend Christy is having a party. Eighteen people are coming. I told her I’d help her set up tables. We know that 6 people can sit at each table, but we’re not sure how many tables we’ll need.

10. Look back at your work from today’s Application Problem. With a partner, compare the steps you took to solve both the bracelet problem and the party problem. Notice the number sentences too. Next weekend, my friend Christy is having a party. Eighteen people are coming. I told her I’d help her set up tables. We know that 6 people can sit at each table, but we’re not sure how many tables we’ll need. I’m hearing you notice that the unknown was different in each problem. We divide when we want to find the size of the groups or the number of groups.

11. Quick practice Problem! Let’s say that 7 is the size of our groups – what will our unknown represent? Draw a number bond to help find our unknown. Thumbs up when you’re finished.

12. Problem 2 15 is the total number of burgers 3 is the numbers of burger in each pack Is the unknown the number of groups or the size of the group? The number of groups On your personal white board or in your math notebooks, write the equation you would use to find how many packs to buy. 15 ÷ 3 = _____

13. p Let’s draw to find out how many packs of burgers Christy needs to buy.Let’s draw to find out how many packs of burgers Christy needs to buy. 15 ÷ 3 = _____ How many packs does Christy need? Let’s write the total number of burgers under each pack. WHY did we stop at 15? What connection can you make between this and our group counting at the beginning of the lesson? Count by threes with me, and track the number of threes on your fingers. How many three did we count? Skip-counting also shows us that Christy needs 5 packs of burgers.

14. PROBLEM SET