Transcript Precision and - Skyline R2 School

Objective
Analyze measurement
Vocabulary
Precision
The precision of a measurement depends on
the unit of measure. The smaller the unit, the
more precise the measurement is
Vocabulary
Significant digits
All of the digits of a measurement that are
known to be accurate plus one estimated digit
zeros between the last non-digit number and the
decimal are not significant
150.
zeros to the right of the decimal are significant
150.00
Example 1 Identify Precision Units
Example 2 Identify Significant Digits
Example 3 Identify Significant Digits
Example 4 Add Measurements
Example 5 Multiply Measurements
Identify the precision unit of the
thermometer.
Precision is the smallest unit of
measurement used
Look at the scale between 0 and 10
There are 5 has marks
10  5
Answer: 2 degrees
Divide 10 by 5
Add dimensional
analysis
Identify the precision unit of the ruler.
Answer:
inch
Determine the number of significant digits in the
measure 5,000 feet.
5,000
Write the number
Zeros between the last non-digit number
and the decimal are not significant
There are 3 zeros between the last
non-digit number and the decimal so
they are not significant
Answer:
1 significant digit
Determine the number of significant digits in the
measure 30,080 feet.
Answer: 4 significant digits
Determine the number of significant digits in the
measure 21.0 miles.
21.0
Write the number
Zeros to the right of the decimal are
significant
Answer: 3 significant digits
Determine the number of significant digits in the
measure 4,700.00 miles.
Answer: 6 significant digits
Determine the number of significant digits in the
measure 315.05 ounces.
315.05
Write the number
3 significant digits to the left of the decimal
2 significant digits to the right of the
decimal
Answer:
5 significant digits
Determine the number of significant digits in the
measure 35.006 centimeters.
Answer: 5 significant digits
MAIL Venita took four packages to the post office.
They weighed 1.27 pounds, 3.45 pounds, 0.524 pound,
and 2.7 pounds. Write the combined weight of her mail
using correct precision.
Write numbers lining
up the decimals
2 decimal places
1.27
3.45
2 decimal places
Add (use calculator)
0.524
3 decimal places
Find the number with the
least decimal places
1 decimal place
7.944
Answer: 7.9 pounds
Write answer with 1
decimal place
DELI Veric bought 1.5 pounds of turkey, 0.75 pound of
roast beef, 2.4 pounds of ham, and 0.5 pound of
salami. Write the combined weight of the lunch meat
that Veric bought using correct precision.
Answer: 5.2 lb
Use the correct number of significant
digits to find the volume of the cylinder.
V =   (4.125 in )2  3.5 in
V =   17.0156 in2  3.5 in
Write formula for volume of
cylinder
Replace r with 4.125 in
Replace h with 3.5 in
Follow order of operations
P
E
MD
AS
Evaluate (4.125)2
Use the correct number of significant
digits to find the volume of the cylinder.
V =   (4.125 in )2  3.5 in
Multiply numbers
V =   17.0156 in2  3.5 in
Multiply units
V = 187.0965 . . .in3
Determine number with the
least significant digits
Answer:
V = 190 in3
3.5 has 2 significant digits,
so round answer to 2
significant digits
*
Use the correct number of significant digits to find
the volume of the rectangular prism.
Answer:
Lesson 7:9
Assignment
Measurement: Precision
and Significant Digits
14 - 37 All