Module 5 Lesson 8. Objective Relate manipulative representations to the addition algorithm.

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Presentation transcript:

Module 5 Lesson 8

Objective Relate manipulative representations to the addition algorithm.

Application Problem Susan has 37 pennies. M.J. has 55 pennies more than Susan. How many pennies does M.J. have? How many pennies do they have altogether?

Fluency Practice 2 puppies plus 1 puppy is...? 3 dogs, 2 puppies, plus 1 puppy is...? Say the number in unit form. Say the addition sentence and answer in unit form. Write the addition sentence on your personal boards =____ =____ =____ =____ =____ =____.

Sprint: two-digit Addition Sprint ASprint A On your mark, get set, THINK!On your mark, get set, THINK! Sprint BSprint B On your mark, get set, THINK!On your mark, get set, THINK!

Concept Development What is ? Talk to your partner for 15 seconds about how you know.. What is ? Talk to your partner for 15 seconds about how you know. What is ? Solve problem with a partner or independently. Why was this problem more difficult to solve mentally? What would be a better way to solve this problem to be sure we get the right answer? Let’s try a few more problems that might require the written addition.

Concept Development Read the problem aloud. Talk with your partner. How could you solve this problem using mental math? Can we check our work using the written form? Turn and talk: How do we set up this problem to record it vertically?

Concept Development Let’s solve using our number disks and place value charts. How many hundreds do we need for the first addend, the first part? How many tens? How many ones? Now for the second addend. Hundred? Tens? Ones? Does this model match the written vertical addition? Okay, we’re ready to solve 3 ones + 7 ones is…? What do you see, and what should we do? That’s right! We rename 10 ones as 1 ten. And where does the new unit of ten belong?

Concept Development How do we record new groups below on our written addition? Turn and talk. Why do we write the one here? Now, let’s add the tens. 0 tens + 3 tens + 1 ten? Did we make a new hundred? Now, let’s move on to the next larger unit, the hundreds. How many hundreds do we have? Turn and talk: Where do we record that on the written addition? What is ? Explain to your partner how each change that I modeled on my place value chart matches each step that I recorded in the written addition

Concept Development Now it’s your turn. Write as I did. Turn and talk: How can we solve this mentally? How can we check our mental math to be sure we are correct? Model both addends on your place value chart. We’re ready to solve! You try

Concept development Let’s check our work