1. Do First
Actions: Turn in your graph worksheet into the hw drawer and take you name tent out 1. and 2. Find two things wrong with the graph below:

2. Agenda
Absent Policy
Metric System Notes
Metric Conversion Practice

3. If you are absent Do not ask the teacher: “What did I miss?”
Check the website: jainahs.weebly.com
Grab your missing worksheets from the back
Look at the Do First/DOL sheet in the back
If you are confused about something covered, then ask the teacher before class, after class, or during RISE. Do not ask during class unless it is being covered.

5. And converting among units
The Metric System
And converting among units

6. The Metric System
The metric system is used by scientists world-wide to minimize confusion
Also known as Système Internationale d’Unités, or “SI”

7. There are more base units, but these are the most common
The Metric System
The essence of metric to metric conversions is recognizing the base units
Length = meter (m)
Volume = liter (L)
Mass = gram (g)
Time = second (s)
Each base unit can have one of many prefixes attached to it
As with any other prefix, the prefix means the same thing regardless of the base unit it is attached to
There are more base units, but these are the most common

8. How to use the staircase model
The Metric System
How to use the staircase model
Example:
Meters to centimeters
King
Kilo-
Henry
Hecto-
Died
Decka- by
Base Unit
(m/L/g/s)
drinking
deci-
chocolate
centi-
milk
milli-
Identify the two units you need to find an equality between

9. How to use the staircase model
The Metric System
How to use the staircase model
Example:
Meters to centimeters
King
Kilo-
Henry
Hecto-
Died
Decka- by
Base Unit
(m/L/g/s)
drinking
deci-
chocolate
centi-
milk
milli- 1 1
2. Put a “1” under the “higher” unit and a “1” under the lower unit

10. How to use the staircase model
The Metric System
How to use the staircase model
Example:
Meters to centimeters
King
Kilo-
Henry
Hecto-
Died
Decka- by
Base Unit
(m/L/g/s)
drinking
deci-
chocolate
centi-
milk
milli- 1 1
3. Count how many steps it takes to get to the lower unit.

11. How to use the staircase model
The Metric System
How to use the staircase model
Example:
Meters to centimeters
King
Kilo-
Henry
Hecto-
Died
Decka- by
Base Unit
(m/L/g/s)
drinking
deci-
chocolate
centi-
milk
milli- 1 1
0 0
4. Add that many zeros to the “1” under the lower unit.

12. How to use the staircase model
The Metric System
How to use the staircase model
Example:
Meters to centimeters
King
Kilo-
Henry
Hecto-
Died
Decka- by
Base Unit
(m/L/g/s)
drinking
deci-
chocolate
centi-
milk
milli- 1 m = 1
0 0
C m
5. Add the units to each number and an “equals” sign between the two numbers

13. A Note about Volume Volume is the space occupied by an object
Its unit (liter) is a combination of other base units
A LITER is actually one cubic decimeter (dm³)
A milliliter is actually one cubic centimeter (cm³)
1dm³
1dm³
1dm³

14. Temperature Kelvin is the SI base unit for temperature
Zero Kelvin is a point where all particles are at their lowest possible energy state
Scientists often use the Celsius scale for ease of use
Kelvin (K) = °C + 273

15. Density Density is defined as the amount of mass per unit of volume
Like volume, it is found by combining two other base units
The equation for Density is:
Density = Mass / Volume

16. Density
Example: What is the density of an object if its mass is 13.5 grams and its volume is 5 cm³? 3 3

17. Density
Example: What is the density of an object if it’s mass is 13.5 grams and it’s volume is 5 cm³? 3 3

18. Density
Example: What is the density of an object if it’s mass is 13.5 grams and it’s volume is 5 cm³? 3 3

19. Density
Example: What is the density of an object if it’s mass is 13.5 grams and it’s volume is 5 cm³? 3 3

20. Converting among Metric Units
To convert among units, change the equalities into fractions, and arrange the fractions so that the units can cancel out
Example:
How many milligrams are in 35 grams?
We know that 1 gram = 1000 mg, which is the same as writing it as
Which fraction should we use?
We want to CANCEL OUT grams and be left with milligrams

21. Converting among Metric Units

22. Converting among Metric Units

23. Converting among Metric Units

24. Converting among Metric Units
Example:
How many grams are in 35 milligrams?
We know that 1 gram = 1000 mg, which is the same as writing it as
Which fraction should we use?
We want to CANCEL OUT milligrams and be left with grams

25. Converting among Metric Units

26. Converting among Metric Units

27. Converting among Metric Units

28. Metric Conversion Practice
SHOW YOUR WORK!

29. DYL: Did you Learn? 1. What is the formula for density?
2. What is the phrase to remember for metric units?