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MODULE 3 Lesson 16

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Objective Compare two three-digit numbers using, and =.

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Sprints Sums-Crossing Ten Put your name and number at the top of the page. Sprint A On your mark, get set, THINK Sprint B On your mark, get set, THINK

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Story Problem At recess Diane skipped rope 65 times without stopping. Peter skipped rope 20 times without stopping. How many more times did Diane skip rope than Peter? What do you see? Can you draw something? What can you draw? Use your RDW (Read, Draw, Write) process. What conclusions can you make from your drawing? I notice some of you used addition and some of you used subtraction to find the answer.

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Story Problem Continued Who would like to share what they wrote?

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Story Problem Continued Were you missing a part or the whole? A part. Turn and talk to your partner about what is the missing part in the story of Diane and Peter. It’s the number of jumps Diane did that Peter didn’t do. It’s how many more Peter had to do to have the same number of jumps as Diane. We are comparing. What have you learned about comparing and subtraction? To compare, you subtract, because you’re finding the part that is missing. Let’s look at that missing part in our drawings. See if you can find them. Talk to your partner. Can you make a connection between the number sentence and the missing part? Who would like to share?

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Concept Development Materials Needed: Unlabeled hundreds place value chart, place value disks, personal white board, Problem Set 1 Use place value disks to show 74 on your place value chart. Which disks did you use from greatest to smallest? Tens and ones.

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Concept Development Continued Add 1 disk so the number becomes 174. What did you add? A hundred. Which number is greater? 74 or 174? 174! Let’s state that as a sentence. 174 is greater than 74.

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Concept Development Continued Change your disks to show 105. Which disks did you use from greatest to smallest? Hundreds and ones. Now, make the number 135. Which number is less, 105 or 135? 105. Say it as a sentence. 105 is less than 135. Talk to your partner. How can you tell? Who would like to share their thinking?

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Concept Development Continued Show 257 on your place value chart. Change it to show 250. Which number is greater, 257 or 250? 257. Say it as a sentence. 257 is greater than 250. How do you know? Continue with other examples until students gain proficiency.

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Pictorial Take two minutes to draw each number using hundreds, tens, and ones. Compare with your partner. How are your drawings alike? Look carefully at our three numbers. Which is greatest? 724! Turn and tell your partner how you know. Turn and tell your partner, why might comparing units help us figure out which number is greatest?

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Hundreds are the biggest unit. So, if a number has 7 hundreds and the other only has 4, you already know that the one with 7 has to be greatest. If we use this strategy, which number is smallest? 274! Who would like to share how you compare tens? Name just the TENS, and say the three numbers from greatest to smallest. 72 tens, 47 tens, 27 tens. Use the symbols to write a number sentence with all three numbers at the bottom of Problem Set 1. Check your partner’s work. It might look different from yours, but make sure you agree it’s true.

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341 and 329 Look at numbers above. The number of hundreds is the same. What would you do to compare them? Look at the tens. 4 tens is more than 2 tens. Complete the Problem Set by drawing values on the place value chart as specified and answering the included questions.

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