Rounding to the Nearest Ten: Making Math Easier!

Mathematics Grades 3rd Grade 5:08 Video
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Lesson Description

Learn how to round numbers to the nearest ten! This lesson uses a fun video and real-life examples to help you estimate and solve math problems in your head.

Video Resource

How to Round Tens

Miacademy Learning Channel

Duration: 5:08
Watch on YouTube

Key Concepts

  • Place Value
  • Rounding Up
  • Rounding Down
  • Estimation

Learning Objectives

  • Students will be able to identify the tens place in a two-digit number.
  • Students will be able to round two-digit numbers to the nearest ten.
  • Students will be able to apply rounding to estimate sums in real-world scenarios.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever estimated the cost of something at the store. Introduce the idea of rounding as a way to make estimation easier. Show the 'How to Round Tens' video from Miacademy Learning Channel.
  • Understanding the Rules (10 mins)
    After watching the video, review the rules of rounding. Explain that if the digit to the right of the tens place is 5 or greater, we round up. If it's 4 or less, we round down. Use examples like $1.99 rounding to $2.00 to connect with their experiences.
  • Practice Rounding (15 mins)
    Write several two-digit numbers on the board (e.g., 23, 47, 61, 85, 92). Have students identify the tens place and the digit to its right. Guide them through the process of rounding each number to the nearest ten, explaining their reasoning. (23 rounds to 20, 47 rounds to 50, 61 rounds to 60, 85 rounds to 90, and 92 rounds to 90)
  • Real-World Application (10 mins)
    Present real-world scenarios where rounding is useful. For example: 'You want to buy a toy that costs $38 and a book that costs $22. About how much money do you need?' Guide students to round $38 to $40 and $22 to $20, then add the rounded numbers to estimate the total cost.
  • Wrap-up and Assessment (10 mins)
    Review the key concepts of rounding to the nearest ten. Distribute the multiple-choice quiz and the fill-in-the-blank quiz to assess student understanding.

Interactive Exercises

  • Number Line Rounding
    Draw a number line on the board with tens marked (e.g., 10, 20, 30, 40). Give students a number (e.g., 26) and have them place it on the number line. Ask them which ten the number is closer to, reinforcing the concept of rounding.
  • Rounding Game
    Divide the class into two teams. Call out a two-digit number. The first team to correctly round the number to the nearest ten gets a point. The team with the most points wins.

Discussion Questions

  • When might you use rounding in your everyday life?
  • Why is rounding helpful for estimation?
  • What happens to the tens place when you round up? What happens when you round down?

Skills Developed

  • Number Sense
  • Estimation
  • Problem-Solving
  • Place Value Understanding

Multiple Choice Questions

Question 1:

What does it mean to round a number?

Correct Answer: To express it to the nearest given place

Question 2:

When do you round UP to the next ten?

Correct Answer: When the number to the right of the tens place is 5 or more

Question 3:

What is 36 rounded to the nearest ten?

Correct Answer: 40

Question 4:

What is 21 rounded to the nearest ten?

Correct Answer: 20

Question 5:

You have $42. Rounded to the nearest ten, about how much money do you have?

Correct Answer: $40

Question 6:

If a candy bar costs $0.79, about how much does it cost rounded to the nearest ten cents?

Correct Answer: $0.80

Question 7:

Which of these numbers rounds down to 50?

Correct Answer: 54

Question 8:

Which of these numbers rounds up to 80?

Correct Answer: 78

Question 9:

What happens to the ones place after you round to the nearest ten?

Correct Answer: It becomes 0

Question 10:

Why is rounding useful?

Correct Answer: It makes math problems easier to estimate

Fill in the Blank Questions

Question 1:

Rounding makes numbers easier to ________ and understand.

Correct Answer: read

Question 2:

If the number to the right of the tens place is 5 or more, you round ____.

Correct Answer: up

Question 3:

If the number to the right of the tens place is less than 5, you round _____.

Correct Answer: down

Question 4:

48 rounded to the nearest ten is ____.

Correct Answer: 50

Question 5:

13 rounded to the nearest ten is ____.

Correct Answer: 10

Question 6:

When you round to the nearest ten, the ones place always becomes a ____.

Correct Answer: 0

Question 7:

Rounding helps you make an _________ or close guess.

Correct Answer: estimate

Question 8:

You can use rounding when you're at the ________ to see if you have enough money.

Correct Answer: store

Question 9:

The number to the right of the tens place is in the ________ place.

Correct Answer: ones

Question 10:

The tens place increases by 1 when you ______ up.

Correct Answer: round

Educational Standards

3.N.1.5:Use place value understanding to round numbers to the nearest thousand, ten-thousand and hundred thousand. 3.N.2.4:Recognize when to round numbers and apply understanding to estimate sums and differences to the nearest ten thousand, thousand, hundred, and ten.

Teaching Materials

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