# 6.9 - Measurement

6.9    The student will make ballpark comparisons between measurements in the U.S. Customary System of measurement and measurements in the metric system.

Bloom's Level:  Analyze

### BIG IDEAS

• I can determine how many 8 ounce cups I can fill from a 2 liter bottle, how many miles I will have run if I finish the 5K race, and how many 500 pound cows can be hauled on a stock truck with a 1500 kg capacity.
• I will be able to determine which units of measurement, both customary and metric, to use for various situations.

### UNDERSTANDING THE STANDARD

• Making sense of various units of measure is an essential life skill, requiring reasonable estimates of what measurements mean, particularly in relation to other units of measure.
• 1 inch is about 2.5 centimeters.
• 1 foot is about 30 centimeters.
• 1 meter is a little longer than a yard, or about 40 inches.
• 1 mile is slightly farther than 1.5 kilometers.
• 1 kilometer is slightly farther than half a mile.
• 1 ounce is about 28 grams.
• 1 nickel has the mass of about 5 grams.
• 1 kilogram is a little more than 2 pounds.
• 1 quart is a little less than 1 liter.
• 1 liter is a little more than 1 quart.
• Water freezes at 0°C and 32°F.
• Water boils at 100°C and 212°F.
• Normal body temperature is about 37°C and 98°F.
• Room temperature is about 20°C and 70°F.
• Mass is the amount of matter in an object. Weight is 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 dependent 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, as shown by the questions: “How much does it weigh?” versus “What is its mass?”
• The degree of accuracy of measurement required is determined by the situation.
• Whether to use an underestimate or an overestimate is determined by the situation.
• Physically measuring objects along with using visual and symbolic representations improves student understanding of both the concepts and processes of measurement.

### ESSENTIALS

• What is the difference between weight and mass? Weight and mass are different. Mass is the amount of matter in an object. Weightis 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 dependent on the gravitational pull at its location.
• How do you determine which units to use at different times?  Units of measure are determined by the attributes of the object being measured. Measures of length are expressed in linear units, measures of area are expressed in square units, and measures of volume are expressed in cubic units.
• Why are there two different measurement systems?
Measurement systems are conventions invented by different cultures to meet their needs. The U.S. Customary System is the preferred method in the United States. The metric system is the preferred system worldwide.

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

6.91  Estimate the conversions of units of length, weight/mass, volume, and temperature between the U.S. Customary system and the metric system by using ballpark comparisons.

Ex: 1 L ≈ 1qt.  Ex: 4L ≈ 4 qts.

6.92  Estimate measurements by comparing the object to be measured against a benchmark.

### KEY VOCABULARY

inch, foot, yard, mile, millimeter, meter, kilometer, ounces, pounds, tons, milligram, gram, kilogram, cup, pint, quart, gallon, liter, mass, capacity, weight, volume, temperature, Fahrenheit, Celsius, matter, degree of accuracy, square units, cubic units, conversions, U.S Customary System, Metric System, ball park comparisons, underestimate, overestimate

Updated: Jun 06, 2017