Rounding Rodeo: Taming Numbers to the Nearest 10 and 100!

Mathematics Grades 4th Grade 6:17 Video
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Lesson Description

Saddle up for a rounding adventure! Learn how to round whole numbers up to four digits to the nearest 10 and 100 using place value.

Video Resource

Examples rounding to the nearest 10 and 100 | 3rd grade | Khan Academy

Khan Academy

Duration: 6:17
Watch on YouTube

Key Concepts

  • Place Value (Ones, Tens, Hundreds, Thousands)
  • Rounding to the Nearest Ten
  • Rounding to the Nearest Hundred
  • Identifying the Digit to the Right

Learning Objectives

  • Students will be able to round a whole number up to four digits to the nearest ten.
  • Students will be able to round a whole number up to four digits to the nearest hundred.
  • Students will be able to explain the rule for rounding based on the digit to the right of the place value being rounded.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value (ones, tens, hundreds, thousands) using base-ten blocks or a place value chart. Ask students to identify the place value of digits in various numbers. Briefly discuss why rounding is helpful in everyday life (e.g., estimating costs, approximating distances).
  • Video Viewing (10 mins)
    Play the Khan Academy video 'Examples rounding to the nearest 10 and 100 | 3rd grade | Khan Academy'. Encourage students to follow along, taking notes on the examples. Pause the video at key points to ask clarifying questions.
  • Guided Practice (15 mins)
    Work through several examples as a class, mirroring the examples in the video. Emphasize the steps: 1. Identify the place value to be rounded (tens or hundreds). 2. Identify the digit to the right of that place value. 3. Apply the rounding rule: If the digit is 5 or greater, round up. If it is less than 5, round down. Use a number line to visually represent rounding to the nearest ten and hundred.
  • Independent Practice (15 mins)
    Provide students with a worksheet containing a variety of numbers to round to the nearest ten and hundred. Circulate to provide support and answer questions. Encourage students to show their work and explain their reasoning.
  • Wrap-up (5 mins)
    Review the key concepts and rules for rounding. Ask students to share real-world examples of when rounding might be useful. Briefly introduce the concept of rounding to the nearest thousand (optional, if time permits).

Interactive Exercises

  • Number Line Rounding
    Create a large number line on the board or use individual number lines. Provide students with numbers and have them physically move to the nearest ten or hundred on the number line.
  • Rounding Relay Race
    Divide the class into teams. Write numbers on the board. One member from each team comes up to round the number to the nearest ten or hundred, then tags the next team member.

Discussion Questions

  • Why is it important to understand place value when rounding?
  • Can you think of a time when you've used rounding outside of school?
  • What happens when you are rounding 9,995 to the nearest 10 or 100?

Skills Developed

  • Place Value Understanding
  • Number Sense
  • Problem-Solving
  • Critical Thinking

Multiple Choice Questions

Question 1:

What is 34 rounded to the nearest ten?

Correct Answer: 30

Question 2:

What is 167 rounded to the nearest hundred?

Correct Answer: 160

Question 3:

When rounding to the nearest ten, which place value do you look at?

Correct Answer: Ones place

Question 4:

When rounding to the nearest hundred, which place value do you look at?

Correct Answer: Tens place

Question 5:

What is 250 rounded to the nearest hundred?

Correct Answer: 300

Question 6:

What is 123 rounded to the nearest ten?

Correct Answer: 120

Question 7:

Which of these numbers rounds to 400 when rounded to the nearest hundred?

Correct Answer: 349

Question 8:

What happens if the number to the right is 5 or greater?

Correct Answer: Round up

Question 9:

What is 4,674 rounded to the nearest 10?

Correct Answer: 4,670

Question 10:

What is 8,346 rounded to the nearest 100?

Correct Answer: 8,300

Fill in the Blank Questions

Question 1:

When rounding to the nearest ______, you look at the ones place.

Correct Answer: ten

Question 2:

When rounding to the nearest ______, you look at the tens place.

Correct Answer: hundred

Question 3:

If a number is 5 or greater, you ______ up.

Correct Answer: round

Question 4:

If a number is less than 5, you ______ down.

Correct Answer: round

Question 5:

45 rounded to the nearest ten is ______.

Correct Answer: 50

Question 6:

349 rounded to the nearest hundred is ______.

Correct Answer: 300

Question 7:

9,995 rounded to the nearest ten is ______.

Correct Answer: 10,000

Question 8:

The place to the right of the hundreds place is the ______ place.

Correct Answer: tens

Question 9:

The place to the right of the tens place is the ______ place.

Correct Answer: ones

Question 10:

8,346 rounded to the nearest ten is ______.

Correct Answer: 8,350

Educational Standards

4.N.1.2:Use place value to describe whole numbers between 1,000 and 1,000,000 in terms of millions, hundred thousands, ten thousands, thousands, hundreds, tens, and ones with written, standard, and expanded forms. 4.N.2.3:Estimate products of 3-digit by 1-digit and 2-digit by 2-digit whole number factors using a variety of strategies (e.g., rounding, front end estimation, adjusting, compatible numbers) to assess the reasonableness of results. Explore larger numbers using technology to investigate patterns.

Teaching Materials

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