Round to the Nearest Hundreds Script

Warm-Up: Counting by Hundreds (3 minutes)

Teacher: "Good morning/afternoon, everyone! Let's get our brains warmed up for some number fun today. We're going to start by counting by hundreds. Who can count with me from 100 all the way to 1000? Let's go!"

(Guide students to count aloud: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000.)

Teacher: "Fantastic! You're all excellent counters. Now, think about this: what numbers are exactly in the middle of two hundreds? Like, what number is exactly between 100 and 200?"

(Pause for responses. Guide them to 150.)

Teacher: "That's right, 150! And between 200 and 300? 250! These '50' numbers are super important for what we're learning today."

Introduction: What is Rounding? (7 minutes)

(Display Round to the Nearest Hundreds Slide Deck - Slide 1: "Rounding To The Nearest Hundreds!")

Teacher: "Today, we're going to learn about a super helpful math skill called rounding numbers to the nearest hundred! Don't worry, it's not as tricky as it sounds. Rounding helps us make numbers simpler and easier to work with, especially when we just need a good estimate."

(Display Round to the Nearest Hundreds Slide Deck - Slide 2: "What is Rounding?")

Teacher: "Imagine you have a big collection of stickers, say, 178 stickers. If someone asks you roughly how many stickers you have, would you say 'about 100' or 'about 200'? Which hundred is 178 closer to on a number line?"

(Allow students to discuss and share their thoughts. Encourage them to visualize a number line.)

Teacher: "Exactly! It's closer to 200. That's what rounding is all about – finding which 'hundred' a number is closest to! It's like putting a number on a number line and seeing which big hundreds landmark it's nearest to."

The Rounding Roller Coaster: Rules & Examples (10 minutes)

(Display Round to the Nearest Hundreds Slide Deck - Slide 3: "The Rounding Rule!")

Teacher: "So, how do we know if we round up or down? We have a special rule, and it all depends on one important digit! When we're rounding to the nearest hundred, we look at the tens digit."

Point to the screen/board:

Teacher: "If the tens digit is 5 or more (like 5, 6, 7, 8, or 9), we round UP to the next hundred! Think of it like a roller coaster going up the hill."

Teacher: "But, if the tens digit is 4 or less (like 0, 1, 2, 3, or 4), we round DOWN to the current hundred! That's like the roller coaster going down the hill, or staying at the bottom."

(Display Round to the Nearest Hundreds Slide Deck - Slide 4: "Let's Practice: Round Up!")

Teacher: "Let's try our first example: Round 178 to the nearest hundred."

"First, we find the hundreds place. That's the 1 in 178. (Point to 1)."

"Next, we look at the important digit right next door – the tens digit. What's the tens digit in 178? It's 7! (Point to 7)."

"Now, think about our rule. Is 7, 5 or more? Yes, it is!"

"So, our rule tells us to round UP! That means 178 rounds up to the next hundred, which is 200! See how 178 is closer to 200 than 100 on a number line?"

(Display Round to the Nearest Hundreds Slide Deck - Slide 5: "Let's Practice: Round Down!")

Teacher: "Let's try another one: Round 123 to the nearest hundred."

"Again, find the hundreds place. It's the 1."

"Now, look at the tens digit. What is it in 123? It's 2!"

"Is 2, 5 or more? No, it's not! It's 4 or less."

"So, our rule tells us to round DOWN! That means 123 rounds down to its current hundred, which is 100! On a number line, 123 is much closer to 100 than to 200."

(Display Round to the Nearest Hundreds Slide Deck - Slide 6: "Your Turn to Round!")

Teacher: "Okay, let's try a few more together. I'll write them on the board, and you tell me what you think. What about the number 450? Where does it go on our number line? Is it closer to 400 or 500? What does our rule say if the tens digit is a 5?"

(Guide students to understand that 450 rounds up to 500. Provide 2-3 additional examples like 265, 731, or 89, drawing them on the board or using a physical number line. Encourage students to suggest answers and explain their reasoning.)

Guided Practice: Show What You Know! (5 minutes)

Teacher: "You're doing great! Now, I have a Rounding to the Nearest Hundred Worksheet for each of you. We're going to work on the first few problems together to make sure we all understand."

(Distribute the worksheets.)

Teacher: "Look at the first problem on your worksheet. What number do we need to round? (Pause). And what's the important tens digit in that number? (Pause). What does our rounding rule tell us to do with that tens digit? Round up or round down? (Pause, guide discussion and correct if needed). And what's the rounded hundred?"

(Guide students through the first 2-3 problems on the worksheet, providing support and clarifying misconceptions. Encourage them to use their number lines or finger-counting strategy if they have them.)

Independent Practice: Your Turn to Round! (3 minutes)

Teacher: "Fantastic! You've got the hang of it during our guided practice. Now it's your turn to try the rest of the problems on your own! Complete the rest of your worksheet. Remember to look closely at the tens digit and think about which hundred the number is closest to. I'll be walking around to help if you get stuck."

(Circulate around the small group, offering individual support and checking for understanding. Provide hints or redirect students as needed without giving direct answers.)

Cool-Down: Quick Check (2 minutes)

(Collect the worksheets.)

Teacher: "Alright everyone, let's do a quick check to wrap up our rounding lesson for today. If I have the number 382, which hundred is it closest to? Turn and tell your shoulder partner or quietly think about it for a moment."

(Listen for student responses and quickly address any remaining confusion. If time allows, ask one or two students to explain their reasoning.)

Teacher: "Great job rounding today! You're becoming rounding experts! Keep practicing, and you'll be rounding numbers like pros in no time!"

Rounding to the Nearest Hundred!

Name: ____________________________

Directions: Round each number to the nearest hundred. Remember to look at the tens digit!

1. 143 rounds to ______________
   
   
   
2. 276 rounds to ______________
   
   
   
3. 350 rounds to ______________
   
   
   
4. 821 rounds to ______________
   
   
   
5. 49 rounds to ______________
   
   
   
6. 615 rounds to ______________
   
   
   
7. 987 rounds to ______________
   
   
   
8. 505 rounds to ______________
   
   
   
9. 749 rounds to ______________
   
   
   
10. 150 rounds to ______________
    
    
    

Challenge Question!

Can you think of a number that rounds to 300 when rounded to the nearest hundred, but is less than 300? Write it here:

__________________________________

Rounding to the Nearest Hundred Answer Key

Directions: Round each number to the nearest hundred. Remember to look at the tens digit!

1. 143 rounds to 100

   • Thought Process: The tens digit is 4. Since 4 is less than 5, we round down to the current hundred.

2. 276 rounds to 300

   • Thought Process: The tens digit is 7. Since 7 is 5 or more, we round up to the next hundred.

3. 350 rounds to 400

   • Thought Process: The tens digit is 5. Since 5 is 5 or more, we round up to the next hundred.

4. 821 rounds to 800

   • Thought Process: The tens digit is 2. Since 2 is less than 5, we round down to the current hundred.

5. 49 rounds to 0 (or 100 if rounding from 0 to 100 range only)

   • Thought Process: This is a two-digit number. The tens digit is 4. Since 4 is less than 5, we round down. When rounding to the nearest hundred, if the number is less than 50, it rounds to 0. If rounding to the nearest non-zero hundred, it would round to 100.

6. 615 rounds to 600

   • Thought Process: The tens digit is 1. Since 1 is less than 5, we round down to the current hundred.

7. 987 rounds to 1000

   • Thought Process: The tens digit is 8. Since 8 is 5 or more, we round up to the next hundred.

8. 505 rounds to 500

   • Thought Process: The tens digit is 0. Since 0 is less than 5, we round down to the current hundred.

9. 749 rounds to 700

   • Thought Process: The tens digit is 4. Since 4 is less than 5, we round down to the current hundred.

10. 150 rounds to 200

    • Thought Process: The tens digit is 5. Since 5 is 5 or more, we round up to the next hundred.

Challenge Question!

Can you think of a number that rounds to 300 when rounded to the nearest hundred, but is less than 300? Write it here:

Possible Answers: Any number from 250 to 299 (e.g., 250, 275, 299).

• Thought Process: To round to 300, the tens digit must be 5 or greater. For a number less than 300, the hundreds digit would be 2. So, any number from 250 up to 299 would round to 300.