Rounding Numbers: Get Close Enough!

Mathematics Grades 4th Grade 8:35 Video
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Lesson Description

Learn the trick to rounding numbers to the nearest ten or hundred. This lesson uses a fun video to explain when and how to round!

Video Resource

Rounding Numbers for Kids

Homeschool Pop

Duration: 8:35
Watch on YouTube

Key Concepts

  • Place Value (ones, tens, hundreds)
  • Rounding to the nearest ten
  • Rounding to the nearest hundred
  • The 'Five or More, Round Up' Rule

Learning Objectives

  • Students will be able to identify the place value of digits in a number.
  • Students will be able to round numbers to the nearest ten.
  • Students will be able to round numbers to the nearest hundred.
  • Students will be able to explain why rounding is useful in real-life situations.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever heard the term 'rounding' before. Discuss situations where they might have heard it (e.g., estimating the cost of groceries). Introduce the Homeschool Pop video 'Rounding Numbers for Kids'. Explain that it will teach them a trick for rounding.
  • Video Viewing (7 mins)
    Play the video 'Rounding Numbers for Kids'. Encourage students to pay attention to the 'five or more, round up' rule.
  • Place Value Review (5 mins)
    After the video, quickly review place values (ones, tens, hundreds). Ask questions like, 'In the number 37, what is the place value of the 3?' and 'In the number 142, what is the place value of the 4?'
  • Guided Practice: Rounding to the Nearest Ten (10 mins)
    Write a number on the board (e.g., 62). Ask students: 'What two tens is 62 between? (60 and 70)'. Then, 'What digit do we look at to decide whether to round up or down? (the ones place)'. 'Is the digit in the ones place five or more? (No)'. 'So, do we round up or down? (Down)'. 'Therefore, 62 rounded to the nearest ten is 60.' Repeat with several other examples.
  • Guided Practice: Rounding to the Nearest Hundred (10 mins)
    Write a number on the board (e.g., 358). Ask students: 'What two hundreds is 358 between? (300 and 400)'. Then, 'What digit do we look at to decide whether to round up or down? (the tens place)'. 'Is the digit in the tens place five or more? (Yes)'. 'So, do we round up or down? (Up)'. 'Therefore, 358 rounded to the nearest hundred is 400.' Repeat with several other examples.
  • Independent Practice (15 mins)
    Provide students with a worksheet or online activity with rounding problems. Include problems rounding to both the nearest ten and the nearest hundred. Walk around to provide assistance as needed.
  • Wrap-up (3 mins)
    Review the 'five or more, round up' rule one last time. Ask students to share real-life examples of when they might use rounding.

Interactive Exercises

  • Number Line Rounding
    Draw a number line on the board. Have students come up and place numbers on the number line and then identify what they round to.

Discussion Questions

  • Why is it sometimes useful to round numbers instead of using the exact number?
  • Can you think of a time you've heard someone use the word 'about' or 'roughly' when talking about a number?
  • How does knowing place value help us with rounding?

Skills Developed

  • Place Value Understanding
  • Estimation
  • Problem Solving
  • Critical Thinking

Multiple Choice Questions

Question 1:

What place value do you look at when rounding to the nearest ten?

Correct Answer: Ones place

Question 2:

What place value do you look at when rounding to the nearest hundred?

Correct Answer: Tens place

Question 3:

Which of these numbers rounds to 50 when rounded to the nearest ten?

Correct Answer: 44

Question 4:

Which of these numbers rounds to 200 when rounded to the nearest hundred?

Correct Answer: 150

Question 5:

What is 86 rounded to the nearest ten?

Correct Answer: 90

Question 6:

What is 321 rounded to the nearest hundred?

Correct Answer: 300

Question 7:

What rule helps us know when to round up?

Correct Answer: Five or more, round up

Question 8:

When you round, are you finding the exact number or an estimate?

Correct Answer: Estimate

Question 9:

Frankie has 39 tennis balls. About how many does he have?

Correct Answer: 40

Question 10:

Which number rounds down to 70?

Correct Answer: 74

Fill in the Blank Questions

Question 1:

When you round to the nearest ten, you look at the _______ place.

Correct Answer: ones

Question 2:

When you round to the nearest hundred, you look at the _______ place.

Correct Answer: tens

Question 3:

The rule is: If the spot before is five or more, ___________ up!

Correct Answer: round

Question 4:

45 rounded to the nearest ten is ___________.

Correct Answer: 50

Question 5:

123 rounded to the nearest hundred is __________.

Correct Answer: 100

Question 6:

Rounding makes a number more _________.

Correct Answer: simple

Question 7:

If you are rounding and the number before is less than 5 you round ______.

Correct Answer: down

Question 8:

82 rounds to _______ when rounded to the nearest 10.

Correct Answer: 80

Question 9:

555 rounds to _______ when rounded to the nearest 100.

Correct Answer: 600

Question 10:

When we use words like 'about' or 'roughly' we are usually ___________.

Correct Answer: rounding

Educational Standards

4.N.1:Compare and represent whole numbers up to 1,000,000 with an emphasis on place value and equality. 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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