Rounding to the Nearest 10: Get Close Enough!

Mathematics Grades 4th Grade 8:50 Video
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Lesson Description

Learn how to round numbers to the nearest 10 using number lines and simple rules. Estimate and simplify numbers for easier calculations!

Video Resource

Rounding to the nearest 10

Khan Academy

Duration: 8:50
Watch on YouTube

Key Concepts

  • Rounding to the nearest 10
  • Using a number line for rounding
  • Identifying the tens place
  • Understanding the 'halfway' rule (rounding up at 5)

Learning Objectives

  • Students will be able to identify the tens place in a given number.
  • Students will be able to round a two-digit or three-digit number to the nearest 10 using a number line.
  • Students will be able to apply the rule for rounding up when a number is halfway between two tens.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students why we might want to round numbers (e.g., estimating totals, simplifying calculations). Introduce the concept of 'rounding to the nearest 10' as finding the closest multiple of 10.
  • Video Viewing (10 mins)
    Play the Khan Academy video 'Rounding to the nearest 10'. Encourage students to take notes on key concepts like identifying the tens place and using a number line.
  • Number Line Practice (15 mins)
    Draw a number line on the board. Give students various numbers (e.g., 23, 46, 75, 112, 138) and ask them to identify where they fall on the number line and which multiple of 10 they are closest to. Emphasize the 'halfway' rule and when to round up.
  • Independent Practice (15 mins)
    Provide students with a worksheet containing numbers to round to the nearest 10. They should show their work by either drawing a number line or explaining their reasoning.
  • Review and Wrap-up (5 mins)
    Review the answers to the independent practice. Answer any remaining questions. Summarize the key rules for rounding to the nearest 10.

Interactive Exercises

  • Number Line Rounding Game
    Create a large number line on the floor using tape. Call out numbers and have students stand on the closest multiple of 10 on the number line.
  • Rounding Relay Race
    Divide students into teams. Provide each team with a set of numbers to round. The first student rounds the first number, then passes it to the next student to check their work. The team that correctly rounds all numbers the fastest wins.

Discussion Questions

  • Why is rounding useful in everyday life?
  • What happens if a number is exactly halfway between two tens? Which way do we round?
  • Can you give an example of when you might need to round a number when you are doing math?

Skills Developed

  • Number sense
  • Estimation
  • Problem-solving
  • Place value understanding

Multiple Choice Questions

Question 1:

What is 27 rounded to the nearest 10?

Correct Answer: 30

Question 2:

What is 64 rounded to the nearest 10?

Correct Answer: 60

Question 3:

What is 85 rounded to the nearest 10?

Correct Answer: 90

Question 4:

What is 11 rounded to the nearest 10?

Correct Answer: 10

Question 5:

What is 132 rounded to the nearest 10?

Correct Answer: 130

Question 6:

If a number ends in 5, 6, 7, 8, or 9, you round...

Correct Answer: Up

Question 7:

What is 56 rounded to the nearest 10?

Correct Answer: 60

Question 8:

What is 92 rounded to the nearest 10?

Correct Answer: 90

Question 9:

What is 33 rounded to the nearest 10?

Correct Answer: 30

Question 10:

If you have 44 pencils, about how many do you have to the nearest 10?

Correct Answer: 40

Fill in the Blank Questions

Question 1:

Rounding helps us make a good ___________.

Correct Answer: estimate

Question 2:

When rounding to the nearest 10, we look at the _______ place.

Correct Answer: ones

Question 3:

Numbers ending in 1, 2, 3, and 4 round ________.

Correct Answer: down

Question 4:

The number 75 rounded to the nearest ten is _______.

Correct Answer: 80

Question 5:

We use a ________ _______ to help us see which ten a number is closest to.

Correct Answer: number line

Question 6:

If a number is halfway, we always round ________.

Correct Answer: up

Question 7:

49 rounded to the nearest 10 is ________.

Correct Answer: 50

Question 8:

121 rounded to the nearest 10 is ________.

Correct Answer: 120

Question 9:

Another word for rounding is __________.

Correct Answer: estimating

Question 10:

When we round, we find the closest ________.

Correct Answer: ten

Educational Standards

4.N.1.1:Read, write, discuss, and represent whole numbers up to 1,000,000. Representations may include numerals, words, pictures, number lines, and manipulatives. 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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