Estimation & Rounding


CCSS.MATH.CONTENT.3.OA.D.8 Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.

CCSS.MATH.CONTENT.3.NBT.A.1 Use place value understanding to round whole numbers to the nearest 10 or 100.


30 minutes


In this lesson plan, students will learn about estimation as a problem solving strategy and practice rounding to the nearest 10 and 100. Including 0. The lesson will reinforce rounding up for numbers 5 and greater. Through gameplay and an interactive assessment activity that includes multi-step problem solving, students will practice rounding with an emphasis toward developing mastery. 


Device with web-browser (Chromebook, laptop or desktop computer); or iOS (iPhone/iPad) with access to Google apps. 

Lesson Plan

Watch the video– Problem Solving: Estimate (optional if playing Making Camp)

This animated movie explains how estimation and rounding can be used to solve problems that don’t require exact calculations, including multi-step word problems with an example. It also explains how rounding can be used to make numbers easier to work with and includes an example with rounding to the nearest hundreds. (3:44)

2. GAME: Making Camp Premium

Have students play Making Camp for 15-20 minutes, including this icon activity on estimation.

This activity will also reinforce visual estimation skills.


A Day at the State Fair: Estimation is Everywhere

If your students have not previously used virtual manipulatives you may want to watch this short video.

This interactive, narrative-driven activity walks students through 6 in-context uses (multi-step word problems) of estimation and rounding to the nearest tens or hundreds, including rounding both up and down, to 0 and 100, and rounding up from 5. 

You may elect to read and work through it during class time, giving students time to complete the problems or assign it as an individual assignment.  Estimated time to complete: 10-15 minutes.

Also, remember that you can always see your students’ performance on the problems in Making Camp Premium by accessing the reports page. You will need to enter the password you received during training.

State Standards

Minnesota Math Standard – Solve real-world and mathematical problems requiring addition, subtraction, multiplication and division of multi-digit whole numbers. Use various strategies, including the inverse relationships between operations, the use of technology, and the context of the problem to assess the reasonableness of results.

Minnesota Math Standard – Round numbers up to the nearest 10 and 100 and round numbers down to the nearest 10 and 100.

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