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This lesson provided by:
Author: Marta Cole
System:Madison City
School:Columbia Elementary School
Lesson Plan ID: 26255

Up or Down? (Rounding Numbers)


This is a lesson in which students identify and demonstrate usage of the rules for rounding numbers to the nearest 100.  Once the rules are internalized the students can extend the process of rounding number  to 99,000,000.

This lesson plan was created as a result of the Girls Engaged in Math and Science University, GEMS-U Project.

Content Standard(s):
TC2(3-5) 5. Practice safe use of technology systems and applications.
TC2(3-5) 9. Use technology tools to organize, interpret, and display data.
MA2013(3) 10. Use place value understanding to round whole numbers to the nearest 10 or 100. [3-NBT1]
ELA2013(3) 27. With guidance and support from adults, use technology to produce and publish writing (using keyboarding skills) as well as to interact and collaborate with others. [W.3.6]
ELA2013(3) 34. Report on a topic or text, tell a story, or recount an experience with appropriate facts and relevant, descriptive details, speaking clearly at an understandable pace. [SL.3.4]
Local/National Standards:

NCTM Standard:

use a variety of methods and tools to compute, including objects, mental computation, estimation, paper and pencil, and calculators.

Primary Learning Objective(s):

The learner will demonstrate the rules of rounding numbers by rewriting numbers to the nearest 100.

Additional Learning Objective(s):  
Approximate Duration of the Lesson: 91 to 120 Minutes
Materials and Equipment:

AMSTI Journals


Technology Resources Needed:

Interactive Whiteboard

Computer Lab or Computer on Wheels (POW) Lab

Rounding Numbers Web Lesson

The Sea Shell Rounding Game Internet Interactive

Rounding Numbers Lesson 2  Internet Lesson and Worksheets

The Basketball Game Internet Basketball Game writing and rounding large numbers


The teacher should be familiar with the basic rules of rounding prior to teaching the skill.


  • Rounding makes numbers that are easier to work with in your head.
  • Rounded numbers are only approximate.
  • An exact answer generally can not be obtained using rounded numbers.
  • Use rounding to get a answer that is close but that does not have to be exact.

    How to round numbers

  • Make the numbers that end in 1 through 4 into the next lower number that ends in 0. For example 74 rounded to the nearest ten would be 70.
  • Numbers that end in a digit of 5 or more should be rounded up to the next even ten. The number 88 rounded to the nearest ten would be 90.

Students should be able to count at least to 100 prior to this lesson.

They also should have had practice in estimation to be able to understand the concept and necessity of rounding.



Step One:

The teacher should introduce rounding numbers using the  Rounding Numbers Web Lesson on the Interactive Whiteboard.  This website is the aid for instruction and discussion.  It first goes over when and why numbers are rounded.  These rules and examples would be excellent  for students to write in their AMSTI Journals before moving to Step Two.

Step Two:

Using the Rounding Numbers Web Lesson the students will practice rounding numbers. This should first be done whole group on the Interactive Whiteboard. Through teacher observation, students could be assigned to work in partners and/or individually for more practice as needed.

Step Three:

In Computer Lab  or using POW Labs, the students will use the Rounding Numbers Web Lesson Play component to play the Rounding Game.  Instruct the students to put their name on a note card and record their scores.  When turned in this will provide assessment information for the teacher to use for further practice, remediation and/or extension.

 Step: Four:

Pair the students into mixed ability pairs.  The students will work with paired partners to play The Sea Shell Rounding Game.  This can be done in Computer Lab or POW Lab.  The students will again use note cards to record the number of starfish each student earns.  When turned in this will again provide assessment information for the teacher to use for practice, remediation and/or extension. 


Attachments:**Some files will display in a new window. Others will prompt you to download.
Assessment Strategies:

Teacher observation and recording of note cards will allow the teacher to assess who has mastered the skill and/or who needs remediation.


Interactive Website The Basketball Game writing and rounding large numbers


An additional Rounding Numbers Lesson 2 is very specific for remediation problems and also has worksheets to put on the Interactive Whiteboard and/or reproduce.

Each area below is a direct link to general teaching strategies/classroom accommodations for students with identified learning and/or behavior problems such as: reading or math performance below grade level; test or classroom assignments/quizzes at a failing level; failure to complete assignments independently; difficulty with short-term memory, abstract concepts, staying on task, or following directions; poor peer interaction or temper tantrums, and other learning or behavior problems.

Presentation of Material Environment
Time Demands Materials
Attention Using Groups and Peers
Assisting the Reluctant Starter Dealing with Inappropriate Behavior

Be sure to check the student's IEP for specific accommodations.
Variations Submitted by ALEX Users:
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