Estimating Lengths (Metric)

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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

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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.

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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

Measurement and Data

Students will estimate lengths using units of inches, feet, centimeters, and meters.

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