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# Third Grade ◆ Lesson One

• 6.

Sometimes, the metric system seems more complicated to use than it is. That’s because when using the metric system in the U.S., we usually are con- verting from the English to the metric system.

• 7.

The basics of the metric system and sample comparisons:

• a.

Volume: Liter (slightly larger than a quart);

• b.

Time: years, hours, minutes, and seconds (same as English system);

• c.

Weight and mass: Gram;

• d.

Temperature: Celsius (32 degrees Fahrenheit = 0 degrees Celsius);

• e.

Length: Millimeter = 1/1,000th of a meter (1 inch = 25 millimeters), Centimeter = 1/100th of a meter (1 foot = 30 centimeters), Meter (1 yard = .9 meters), Kilometer = 1,000 meters (1 kilometer = .6 miles).

• B.

The teacher shows the class drawings comparing the lengths of various objects measured in both the English and metric systems (provided). The teacher explains that each student will measure the size of an object using metric measurements.

• C.

The teacher assigns each student one or more classroom objects to measure and gives each student a cut-out metric ruler (included). The teacher demonstrates how to use the metric ruler. Each student writes down on a piece of paper the name of the object or objects to be measured and draws a picture of each object. The student then measures the object in the metric system and writes down the measurement next to the drawing of the object.

• D.

After the class has completed Part C, each student explains the object measured and its metric measurement to the class.

# TEACHER’S EVALuATION

A. Analyze students’ understanding of the concept of an alternate system of measuring lengths, weights, volume, etc.

B. Evaluate each student’s ability to accurately measure with the new ruler.

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