Module 5 Lesson 16. Objective Subtract from multiples of 100 and from numbers with zero in the tens place.

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Presentation transcript:

Module 5 Lesson 16

Objective Subtract from multiples of 100 and from numbers with zero in the tens place.

Application Problem Will read 15 more pages than Marcy. Marcy read 38 pages. The book is 82 pages long. How many pages did Will read? How many more pages does Will need to read to finish the book?

Sprints: Subtraction from Teens Sprint A On your mark, get set, THINK! Sprint B On your mark, get set, THINK!

Coin Drop Name my coin. How much is it worth? Listen carefully as I drop coins in my can. Count along in your minds. How much money is in the container? How much money is still in the container? Let’s try another.

More and Less Let’s count by tens. How many dimes are shown? What is the value of 6 dimes? What is 5 cents more? Give the number sentence. What is 10 cents less? Give the number sentence.

Concept Development Problem 1: 402 – 231 Let’s solve this problem using a math drawing and the algorithm. Rewrite the problem vertically with me. Which number is the whole? Let’s make a chip model to show the whole. I’ll draw it on the board while you draw yours. Whisper-count as you draw your dots. Let’s draw our magnifying glass and get ready to subtract! Look at your model. Are we ready to subtract in the ones?

Moving on, let’s look at the tens place. I don’t see any tens in the tens place on the model. Point to the digit that represents this in the algorithm. The zero holds the tens place open and tells us the number is 402. Without that 0, what number would we read? Yes, so we must be precise when writing and representing numbers. Where can we get some tens so we can subtract 3 tens? Let’s show that on our models. Count with me as we rename 1 hundred as 10 tens. Show that using the algorithm. As I do the same, check your work with mine. Are we ready to subtract now in the tens place?

Let’s look at the hundreds place. Are we ready to subtract in the hundreds? Then we’re ready to subtract! Talk with your partner. Take turns sharing how you showed the subtraction on your model and using the algorithm. Read the complete number sentence. How can we prove that our answer is correct? Yes! Please check your answer by drawing a chip model to add the two parts. If you are correct, write the number bond for this problem.

Concept Development Problem 2: 800 – 463 Talk with your partner. What do you notice about the whole and what will we need to do? Let’s do that. Count aloud as you rename 1 hundred as 9 tens 10 ones. Stop! Now, count on as you draw the ones. So 1 hundred is the same as 9 tens 10 ones. True?