Estimating Lengths (Metric)

Times up!
Times up! You may finish answering the current question and then proceed to your score!
Sorry, you have used all of your available hints for this lesson.
Sketch Pad
Practice Limit Reached

You've reached your daily practice limit of 12 questions.

When you sign up for a free account and login, you can play all you'd like.

(Must be 18 years old to sign up.)

Award Information
Awarded to
Question Hint
Student Log In
Choose Family Member
3rd Grade Estimating Lengths Metric Measurements mm cm km GameThird Grade Estimate Length Metric Meters Centimeters Millimeters Kilometers Game

Interactive Math Lesson - Estimating Lengths with Metric Units

Students will practice estimating lengths with metric units in this fun, interactive math game from In this online math activity geared toward third grade, children will choose the best unit of measure for the given length or distance. The aim of this elementary math practice activity is to build confidence and proficiency in basic measurement skills with metric units.

As students work through this math practice activity, they will be challenged by a variety of measurement questions. Students may be asked whether centimeters or meters is the best unit of measure for the length of a toothbrush. Or they may be asked whether the length of a birthday candle is closer to 70 millimeters or 70 kilometers. Or students may be required to choose which has a length of about 388 kilometers: a soccer field; a lake; or a garden. If students need a little extra help answering a math problem in their practice session, they can opt to use the "Hint" button. The hint consists of a helpful written clue like this one: "For shorter lengths, measure in millimeters and centimeters. For longer lengths, measure in meters and kilometers." When students answer a question incorrectly, a detailed explanation page will reveal the correct answer with an easy-to-understand explanation for how to obtain it.

All math practice activities on "I Know It," including this third-grade measurement lesson, are equipped with several handy features that help students make the most of their math practice session. A progress-tracker in the upper-right corner of the practice screen shows students how many questions they have answered out of the total number of questions in the lesson. A score-tracker lets students know how many points they have earned in the lesson so far. The speaker icon in the upper-left corner of the practice screen indicates the read-aloud feature. Students can click this button to have the question read out loud to them in a clear voice. This is a great resource for ESL/ELL students and students who are auditory processors. These features and more help students succeed in their online math practice endeavors.

3rd Grade Estimating Lengths Metric Measurements mm cm km LessonThird Grade Estimate Length Metric Meters Centimeters Millimeters Kilometers Lesson

I Know It Makes All the Difference

Teachers and homeschool parents love using I Know It to reinforce important elementary math skills with their little learners. Educators appreciate the wide variety of math lessons we offer, spanning dozens of popular math topics for kindergarten through fifth grade. All math lessons on I Know It are aligned to the Common Core Standard and are organized on the website by grade level and topic. Choose from hundreds of math practice activities to use alongside your comprehensive elementary math curriculum.

Students, too, enjoy using the I Know It program to practice their math skills. Each math practice session presents as a fun, yet challenging, math game that helps kids expand their knowledge and train their brains. Whimsical animated characters cheer students on in every math activity, and plenty of positive messages encourage kids to keep going as they progress through their math practice. Students can even earn math awards to add to their virtual trophy case for each new math skill they master.

We hope you and your third-grade class will enjoy practicing estimating lengths with metric units in this interactive math game! Be sure to check out the hundreds of other math lessons we have available on our website as well.

Free Trial and Membership Options

Sign up for a free sixty-day trial of I Know It to try all the exciting math practice activities in our program for free! We're confident you and your students will love the difference interactive math practice can make. When your free trial runs out, we hope you will consider becoming a member of the I Know It community, so you can continue to enjoy the benefits of interactive math practice for a full calendar year.

Your I Know It membership unlocks our program's helpful administrator tools, which make it easy and effective to monitor your students' progress through the program. Our administrator tools allow you to create a class roster, assign unique usernames and passwords to all of your students, give specific lesson assignments to different students, change basic lesson settings, monitor your students' progress with detailed reports, and print, download, and email student progress reports, plus much more!

Students will log in to a kid-friendly homepage using the unique login credentials you have given to them. From the student homepage, kids can quickly access their practice assignments and even explore other math practice activities at their grade level, or beyond if you choose. Grade levels in the student mode of I Know It are labeled with letters instead of numbers, making it easy for you to assign math practice activities based on each child's skill level.

3rd Grade Estimating Lengths Metric Measurements mm cm km ActivityThird Grade Estimate Length Metric Meters Centimeters Millimeters Kilometers Activity


This online math lesson is classified as Level C. It may be ideal for a third-grade class.

Common Core Standard

2.MD.3, MA.2.M.1.1, 3.7D
Measurement And Data

Measure And Estimate Lengths In Standard Units.
Estimate lengths using units of inches, feet, centimeters, and meters.

You might also be interested in...

Linear Measurement (Nearest Centimeter) (Level C)
In this third grade-level math lesson, students will practice linear measurement to the nearest centimeter. Questions are presented in fill-in-the-blank and multiple-choice format.

Length Conversions (Metric) (Level C)
In this math lesson geared toward third-grade, students will practice metric length conversions. Questions are presented in drag-and-drop format and fill-in-the-blank format.