1. Measurements& S.I. Units
Systeme Internationale d’Unites
International System of Units

2. Always write your units!!
I weigh 68,181
Always write your units!!
Units!!??
Give meaning to numbers
Write unit (grams)

3. Liters (L) or Meters cubed (m3) Gram (g) Meter (m) LENGTH VOLUME MASS
Distance from one end of an object to the other end
How much SPACE an object takes up
How much MATTER an object has
Liters (L) or
Meters cubed (m3)
Gram (g)
Meter (m)

4. Practice measuring length
Measuring your hand
Practice measuring length
16.9 cm my hand

5. S.I. over American system
Used by scientists world wide
Much easier to convert -- based on units of 10

6. Prefixes used example: centimeter 1 Centi means 0.01 or 100
Discuss what a “prefix” is.
Have students look at meter sticks set on tables. Show them one cm. How many centimeters are in 1m? Write using smart board

7. Common prefixes for S.I. units
Conversion Factor 1 2 3
KILO 1000 Units
HECTO 100 Units
DEKA 10 Units
DECI 0.1 Unit
Meters Liters Grams
CENTI 0.01 Unit
Fill in chart
MILLI Unit

8. Bigger Number?
____km =____m ____hg = ____mg ____cL = ____mL

9. Conversion Practice
Now convert your hand measurement from centimeters to meters
Convert 16.9 cm to meters to millimeter. Have students draw own hand and find length

10. Practice converting! Compare using <, >, or =.
63 cm m g mg ,500 mL L
536 cm dm mg g m cm