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Standard 5: The Mathematical World

- Numbers: 3.5.1 Select and use appropriate measuring units, such as centimeters (cm) and meters (m), grams (g) and kilograms (kg), and degrees Celsius (°C).
- Activity modeled after http://www.indianastandardsresources.org/files/sci/sci_3_5_1.pdf

Definitions

- Appropriate: Suitable for a particular condition, occasion, or place; fitting.
- Measurement: The dimension, quantity, or capacity determined by measuring
- Units: What the measurement is being done in, (example: inches)

Background Info

- Knowing when to use measurements appropriately is important.
- Here we will explore the importance of measurements and how to use them properly.

What’s missing from these sentences?

- The worm is 3 long.
- Katie’s plant grew 11 tall.
- The school is 22 tall.
- Yesterday it was 34 outside.

Did you figure it out?

- Measurements are what is missing!
- Why do we need measurements?
- Did those sentences make sense without measurements?

Much Better!

- These sentences make a lot more sense when we add in measurements!
- The worm is 3 inches long.
- Katie’s plant grew 11 centimeters tall.
- The school is 22 feet tall.
- Yesterday it was 34° outside.

How do we know?

- You know measurements are important…
- Now you may be wondering: How do I know what measurements to use?
- Make a list of all the measurements you know how to use…

Measurements I Know

- _____________________________________________
- _____________________________________________
- _____________________________________________
- _____________________________________________
- _____________________________________________
- _____________________________________________

Let’s compare our lists…

- Centimeters (cm)
- Meters (m)
- Inches (in)
- Feet (ft)
- Yards (yd)
- Millimeters (mm)
- Miles (mi)
- Kilometers (km)
- Pounds (lbs)
- Grams (g)
- Milligrams (mg)
- Tons (T)

Let’s get started!

- Those were just some examples of measurements you may know how to use. There may be more.
- With all of those how do you know when to use which one?

Length

- Units for measuring in lengths include: millimeters, centimeters, inches, meters, feet, yards, miles, and kilometers.
- Units in yellow are good for small measurements.
- Units in blue are good for medium measurements.
- Units in purple are used for long distances.

Medium Measurements

- Feet, yards, and meters are used to measure things that aren’t big or small. Inches are also used in some cases.
- Examples are:
- The length of a car
- The height of a tree
- The length of a sports field

Small Measurements

- Remember we commonly use millimeters, centimeters, and inches for these.
- Example measurements include:
- The width of a fingernail
- The size of a pebble
- The length of a pencil

Long Measurements

- Miles and kilometers are commonly used for measuring long distances.
- Examples of long measurements include:
- Length of a trip
- Length of a road

Weight Measurements

- Small weights are measured using milligrams or grams. (examples: the weight of a dime or pencil)
- Medium weights are measured using pounds or kilograms. (examples: the weight of a person or animal)
- Things that are heavy are usually measured in tons. (examples: trucks and cars)

Let’s Practice

- You have a penny. What measurements should you use to find its:
- Weight?
- Height? (edge)
- Diameter?

Answers

- Weight- measure weight in grams or milligrams
- Edge height- millimeters would work best for this
- Diameter- centimeters or inches would make the most sense here.

In the bag you should find…

- A worksheet
- Various items
- Rulers
- Follow the directions on the worksheet!

Assessment

- 1. What measurement is appropriate for measuring the length of a pencil?
- A. Yards
- B. Pounds
- C. Feet
- D. Centimeters

Assessment

- 2. If I am wanting to weigh my dog, what measurement should I use?
- A. Kilograms
- B. Tons
- C. Yards
- D. Milligrams

Assessment

- 3. Which of the following would be best measured in yards?
- A. The length of a shoe
- B. The weight of your backpack
- C. The length of a basketball court
- D. The length of your thumb

Resources

- Indiana Department of Education Standard Resources http://www.indianastandardsresources.org/files/sci/sci_3_5_1.pdf

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