1. Warm Up Write down objective and homework in agenda
Lay out homework (Word Problem Worksheet)
Homework (Review sheet)

2. Warm Up Write down five objects you come into contact with each day.
Write down the unit of measure you would use to measure each object.

3. Unit 4 Scientific Notation Common Core Standards
8.EE.1 Know and apply the properties of integer exponents to generate equivalent numerical expressions. For example, 32 x 3-3= 3-3= 1/33 = 1/27.
8.EE.3 Use numbers expressed in the form of a single digit times an integer power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other.
8.EE.4 Perform operations with numbers expressed in scientific notation, including problems where both decimal and scientific notation are used. Use scientific notation and choose units of appropriate size for measurements of very large or very small quantities (e.g., use millimeters per year for seafloor spreading). Interpret scientific notation that has been generated by technology.
8.NS.1 Know that numbers that are not rational are called irrational. Understand informally that every number has a decimal expansion; for rational numbers show that the decimal expansion repeats eventually, and convert a decimal expansion which repeats eventually into a rational number.
MP.1 Make sense of problems and persevere in solving them.
MP.2 Reason abstractly and quantitatively.
MP.4 Model with mathematics.
MP.5 Use appropriate tools strategically.
MP.6 Attend to precision.

4. Think of large objects such as a bus or plane and small objects such as a contact lens or pencil lead
What units of measurement would be appropriate for each

5. Choosing Appropriate Measurements Examples

6. Choose the Best Measurement!
The distance you walk in a week: kilometers or meters
Kilometers
A hiking trail: yards or inches
Yards
A bridge over a river: meters or centimeters
Meters
A loaf of bread: miles or inches
Inches
A tall tree: centimeters or meters

7. Choose the Best Measurement
The size of a whiteboard: inches or miles
Inches
The diameter of the Earth: inches or miles
Miles
Your sister's hair: centimeters or meters
Centimeters
How far you can throw a ball: meters or kilometers
Meters

8. You Try! A piece of chalk: yards or inches
The sugar in a scoop of ice cream: Kilograms or grams
Grams
A soup spoon: centimeters or meters
Centimeters
The height of an office tower: yards or miles
Yards

9. Practice! With a partner you will find the most appropriate unit
We will check the answers in class!!

10. More Word Problems YES!
The Earth moves around the sun at 6.7 × 104 miles per hour. How many miles does the Earth travel after 2.4 × 103 hours (or 100 days)?
D = rt
(6.7 x 104) x (2.4 x 103)
16.08 x 107
1.608 x 108 miles

11. There are × 106 miles of roads in the United States, If, on average, 1.2 × 102 cars went over each mile of road per day, how many miles would be driven each day in the United States?
(3.949 x 106) x (1.2 x 102)
x 108 miles

12. The speed of light is approximately 3 x 10 8 m/s
The speed of light is approximately 3 x 10 8 m/s. How far does light travel in 6.0 x 101 seconds?
D = RT
D = (3 x 108) x (6.0 x 101)
18 x 109
1.8 x 1010 meters

13. You Try!
We have to find out the weight of 6 billion dust particles, if a dust particle has a mass of 7.53 x g.
(6,000,000,000) x (7.53 x 10-10)
(6 x 109) x (7.53 x 10-10)
45.18 x 10-1
4.518 x 100 grams
4.518 grams

14. You Try!
Lake Superior has roughly 25 times the volume of Lake Erie. If the volume of Lake Superior is approximately 1.22 x 104 km3, what is the approximate volume of Lake Erie?
1.22 x 104 25
x 104
4.88 x 102 cubic kilmeters

15. You Try!
The bedroom of our house is 1,200 cubic meters. We know that there are 3.4 x 109 particles of dust per cubic meter. Write how many particles of dust are there in the bedroom of our house?
(1200) x (3.4 x 109)
4080 x 109
4.08 x 1012 particles

16. Extra Help