1. Chapter 1
Measurement

2. Measurements A measurement has two parts: 1. a number value
Examples: 12, 3, 432, etc.
2. a unit
Examples: meters, seconds, ninth graders
List two examples of measurements in your notes, different from what is listed above.

3. Two Systems of Measurement
English (“American”) System - used for everyday measurement in the United States
International System of Units or Metric System - used for everyday measurement in most other countries and for scientific measurements

4. The Metric System Base unit of length Base unit of mass
Base unit of volume

5. Converting in the Metric System
Move the decimal point:
Move decimal to the right
Move decimal to the left

6. The Metric System Prefixes to memorize: pink packet p. 2
List the 4 prefixes in order of size, starting with
the smallest:
milli < centi < [base unit] < kilo
If you have a bunch of pennies, will you have more milligrams of pennies or grams of pennies?
List the 4 prefixes in order of NUMBER of each, starting with the smallest number:
# of kilo < # of [base unit] < # of centi < # of milli

7. The Metric System Summary
milli < centi < [base unit] < kilo
# of kilo < # of [base unit] < # of centi < # of milli
Example:
0.001 kilometer
= ? meter
= ? centimeters
= ? millimeters

8. Converting in the Metric System
SIZE compared to base unit
NUMBER compared to base unit
Example
kilo-
(k)
[base unit]
centi-
(c)
milli-
(m)
1000x larger
1000x smaller
5 km=5000 m
equal
equal
equal
100x smaller
100x larger
1200 cm=12 m
1000x smaller
1000x larger
8 mm=0.008 m

9. Accuracy and Precision
Accuracy: how close a measurement is to the accepted, true value
Precision: how close repeated measurements are to one another

10. Accuracy and Precision
Are the pictures below accurate, precise, accurate and precise, or neither? 1 3 2 4

11. Accuracy and Precision Activity
Complete with assigned partner:
Everyone gets their own target
With eyes closed, spin around in a circle twice then dot the target sheet
4 tries each
Goal = to mark as close to the bull’s-eye each try

12. Accuracy and Precision Activity
Walk around the room and mark 4 different people’s targets on the bottom with one of the following:
A = Accurate
P = Precise
AP = both accurate & precise
N = neither Accurate or Precise