1. Module 5 Lesson 5

2. Objective Use the associative property to make a hundred in one addend.

3. Story Problem Jenny had 39 collectible cards in her collection. Tammy gave her 36 more. How many collectible cards does Jenny have now?

4. Making the Next Hundred Let’s find missing parts to make the next hundred. If I say 170, you would say 30. Ready? 170. Give the number sentence. 190 720 740 940 196216 380 160 370270260 620224 580

5. Making the Next Hundred to Add When I say 9 tens + 4 tens, you say 10 tens + 3 tens. Ready? 9 tens + 4 tens. What is the answer? 19 tens + 4 tens 9 tens + 6 tens 8 tens + 3 tens18 tens + 3 tens 18 tens + 13 tens 19 tens + 6 tens 19 tens + 16 tens 29 tens + 4 tens 29 tens + 14 tens

6. Concept Development What is 17 + 12? What is 17 + 13? That was fast! How did you know? How many tens equal 17 tens plus 13 tens? What is the value of 30 tens? What is 170 + 130? What happened when we added those numbers? Turn and talk. What is 17 + 14? Write it on your board and turn it over so I know when you’re ready. Show me!

7. Concept development How many tens equal 17 tens plus 14 tens? 170 + 140? Talk with your partner. How did you know? How many tens equal 17 tens + 15 tens? 170 + 150? Talk with your partner.

8. Concept Development In the past, we’ve used number bonds to make the next ten. Let’s do it here, too, to make our adding easier when we have hundreds. Is one of these numbers close to the next hundred? Which one? What is it close to? How many more do we need to make 200? Where can we get 10 more? Great idea! Let’s break apart 120 into 110 and 10. Now, we can add the 10 from 120 to the 190. And we know that 190 plus 10 equals 200.

9. Concept Development What is our new addition problem? Talk with a partner. What does this equal? When we have a zero in the ones place, we can think of it as tens. How can we prove that 200 + 110 is the same as 190 + 120? Turn and talk. Solve the following on your own :Solve the following on your own :

10. Concept development So far, we’ve only been working with numbers that have zero in the ones place. Let’s try something different now. What hundred is close to 199? How far away is it? Let’s try decomposing 25 into 24 and 1. We can add the 1 from 25 to the 199. And we know that 199 plus 1 equals 200. What is our new addition problem? And what is the total?

11. Concept development Let’s try another example. I see one number that is close to some hundreds. Which number is that? How far away is it? Talk with a partner. How would you use a number bond to make a new, simpler number sentence? What is 300 + 73? Now let’s try one that has hundreds in both. Which number is closer to the next hundred? With a partner, write the number bond and new addition problem. Then, solve it. 295 + 78 535 + 397

12. Extra Practice 299 + 22 527 + 296 495 + 30