1. Module 6 Lesson 17

2. Objective Relate doubles to even numbers, and write number sentences to express the sums.

3. Subtraction Patterns After I say a basic fact for you to solve, make a pattern sequence by adding 10 to the whole and continue until I say to stop. So, after solving 11 – 9, you would solve 21 – 9, and then31-9 and so forth. Go as high as you can before I give the signal to stop. Let’s begin. 11 – 9. 12 – 8. 11 – 8. 13 – 9.

4. Core Fluency Practice Sets On your mark, get set, THINK!

5. Seven students sit on one side of a lunch table. Seven more students sit across from them on the other side of the table. Draw an array to show the students. Write an addition sentence that matches the array. Three more students sit down on each side of the table. Draw an array to show how many students there are now. Write an addition sentence that matches the new array. Application Problem

6. Concept Development Put your elbows on your desk with your thumbs pointing up. What addition sentence describes the number of fingers pointing up? Pop up your index fingers. What is our new addition sentence? Pop up the next finger on each hand. Our next addition sentence? Pop up the next finger, and give me the addition sentence. Next finger up. Our next addition sentence? What do we call it when both are the same? What patterns do you see in the totals? Discuss with your partner. All these numbers are even. Tell your partner a way to think about even numbers? 2 + 2 = 4. 1 + 1 = 2. 3 + 3 = 6. 4 + 4 = 8. 5 + 5 = 10.

7. Concept Development Good thoughts. Let’s do some more work with even numbers. Partner A, make one row of 6 counters. Partner B, double that row by creating a second row of 6. Look at your array. There are 6 counters in each group. What addition sentence describes it? Partner B, make a row of 7 counters. How many counters should Partner A add to double 7? Do that, Partner A, and let’s add the doubles fact to our list. What should we write? Is 14 even? 2 + 2 = 4. 1 + 1 = 2. 3 + 3 = 6. 4 + 4 = 8. 5 + 5 = 10. 6 + 6 = 12. 7 + 7 = 14.

8. Concept Development What is the next addition sentence we will write? Of course! How did you know? Brilliant! We can express this idea in another way. We can say 5 doubled is 10. Say that with me. What is 3 doubled? Give me the complete sentence. Excellent! Continue using your counters to make all the combinations of even numbers that you can. For each set, record the doubles equation on your personal boards. 2 + 2 = 4. 1 + 1 = 2. 3 + 3 = 6. 4 + 4 = 8. 5 + 5 = 10. 6 + 6 = 12. 7 + 7 = 14. 8 + 8 = 16.