# 5.9 - Metric Measurement

The student will

a) given the equivalent measure of one unit, identify equivalent measurements within the metric system; and

b) solve practical problems involving length, mass, and liquid volume using metric units.

### BIG IDEAS

• So that I can easily identify equivalent measurements within metric unit when following a recipe
• So that a doctor, pharmacist, or scientist can convert milliliters to liters when conducting an experiment
• So that I can measure how much I have grown this year
• So that an architect can use precise measurements to design a structure
• So that a zookeeper can estimate a reasonable amount of space needed to house a new animal

### UNDERSTANDING THE STANDARD

• Length is the distance between two points along a line.
• Metric units for measurement of length include millimeters, centimeters, meters, and kilometers. Appropriate measuring devices include centimeter ruler, meter stick, and tape measure.
• Weight and mass are different. Mass is the amount of matter in an object. Weight is determined by the pull of gravity on the mass of an object. The mass of an object remains the same regardless of its location. The weight of an object changes depending on the gravitational pull at its location. In everyday life, most people are actually interested in determining an object’s mass, although they use the term weight (e.g., “How much does it weigh?” versus “What is its mass?”).
• Balances are appropriate measuring devices to measure mass in U.S. Customary units (ounces, pounds) and metric units (grams, kilograms).
• Metric units to measure liquid volume (capacity) include milliliters and liters.
• Practical experience measuring familiar objects helps students establish benchmarks and facilitates students’ ability to use the appropriate units of measure to make estimates.
• Students at this level will be given the equivalent measure of one unit when asked to determine equivalencies between units in the metric system. An example can be found below.
• Students will be told 1 kilometer is equivalent to 1,000 meters and then will be asked to apply that relationship to determine:
• the number of meters in 3.5 kilometers;
• the number of kilometers equal to 2,100 meters; or
• Seth ran 2.78 kilometers on Saturday. How many meters are equivalent to 2.78 kilometers?

### ESSENTIALS

The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to

• Given the equivalent measure of one unit, identify equivalent measurements within the metric system for the following:
• length (millimeters, centimeters, meters, and kilometers);
• mass (grams and kilograms); and
• liquid volume (milliliters and liters). (a)
• Estimate and measure to solve practical problems that involve metric units:
• length (millimeters, centimeters, meters, and kilometers);
• mass (grams and kilograms); and
• liquid volume (milliliters, and liters). (b)

### KEY VOCABULARY

Updated: Mar 06, 2019