Rounding to the Nearest Ten: Get Close Enough!

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 the Miacademy video to help you understand the rules of rounding and why it's useful for estimating.

Video Resource

Rounding 1: Tens - OLD Math: Level D for Kids!

Miacademy Learning Channel

Duration: 5:08
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Rounding Rules (5 or more, round up; 4 or less, round down)
  • Estimation

Learning Objectives

  • Students will be able to identify the tens and ones place in a two-digit number.
  • Students will be able to round two-digit numbers to the nearest ten using the rounding rules.
  • Students will be able to explain how rounding can be used to estimate a sum in a real-world context.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they've ever estimated a price at the store (like in the video!). Discuss what it means to 'get close' to a number. Introduce the term 'rounding' as a way to make numbers easier to work with.
  • Video Viewing (7 mins)
    Play the Miacademy video 'Rounding 1: Tens - OLD Math: Level D for Kids!'. Encourage students to pay attention to the rounding rules and the examples given.
  • Guided Practice (10 mins)
    Write several two-digit numbers on the board (e.g., 24, 37, 51, 68, 85). For each number, guide students through the rounding process: 1. Identify the digit in the tens place. 2. Identify the digit to the right (ones place). 3. Apply the rounding rule: If the ones digit is 5 or more, round the tens digit up. If the ones digit is 4 or less, the tens digit stays the same. 4. Replace the ones digit with a zero.
  • Real-World Application (8 mins)
    Present a word problem similar to the one in the video: 'You want to buy a toy for $18 and a book for $23. About how much money do you need?' Guide students to round each number to the nearest ten ($20 + $20 = $40) to estimate the total cost.
  • Independent Practice (10 mins)
    Provide students with a worksheet containing various two-digit numbers to round to the nearest ten. Include some word problems that require estimation using rounding.

Interactive Exercises

  • Number Line Rounding
    Draw a number line from 10 to 20 on the board. Have students place different numbers (e.g., 12, 15, 18) on the number line and then determine which ten they are closer to.
  • Rounding Game
    Create cards with two-digit numbers. Have students draw a card and quickly round the number to the nearest ten. Students can play in pairs, taking turns and checking each other's answers.

Discussion Questions

  • Why is rounding helpful?
  • Can you think of other times you might use rounding in everyday life?
  • What happens when the number in the ones place is a 5?

Skills Developed

  • Number Sense
  • Problem-Solving
  • Estimation

Multiple Choice Questions

Question 1:

What does it mean to round a number?

Correct Answer: To make it easier to work with

Question 2:

When do you round up to the next ten?

Correct Answer: When the number in the ones place is 5 or more

Question 3:

What is 37 rounded to the nearest ten?

Correct Answer: 40

Question 4:

What is 62 rounded to the nearest ten?

Correct Answer: 60

Question 5:

Which number rounds up to 50?

Correct Answer: 45

Question 6:

Which number rounds down to 80?

Correct Answer: 81

Question 7:

You have $24. About how much money do you have to the nearest ten?

Correct Answer: $20

Question 8:

You want to buy a toy for $48. About how much does it cost to the nearest ten?

Correct Answer: $50

Question 9:

Rounding helps you do what?

Correct Answer: Estimate the answer

Question 10:

If a number ends in a 0, 1, 2, 3, or 4, what do you do to round it?

Correct Answer: Round down

Fill in the Blank Questions

Question 1:

Rounding makes numbers easier to ______ with.

Correct Answer: work

Question 2:

The number in the _____ place tells you if you should round up or down.

Correct Answer: ones

Question 3:

28 rounded to the nearest ten is ____.

Correct Answer: 30

Question 4:

53 rounded to the nearest ten is ____.

Correct Answer: 50

Question 5:

If a number ends in 5, 6, 7, 8, or 9, you should _____ up.

Correct Answer: round

Question 6:

Rounding is a good way to _____ an answer.

Correct Answer: estimate

Question 7:

You can use rounding to _____ how much things cost.

Correct Answer: estimate

Question 8:

The digit to the right of the tens place is in the _____ place.

Correct Answer: ones

Question 9:

When rounding to the nearest ten, the ones place becomes a _____.

Correct Answer: zero

Question 10:

Estimating and rounding are examples of _____ math.

Correct Answer: mental

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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Student Worksheet Classroom Slides Assessment Quiz
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