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

zeros to the right of the decimal are significant

150.

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 thethermometer.

Look at the scale between 0 and 10

Precision is the smallest unit of measurement used

There are 5 has marks

Divide 10 by 5

10 5

2Add dimensional analysis

Answer: degrees

Identify the precision unit of the ruler.

Answer: inch

Determine the number of significant digits in the measure 5,000 feet.

Answer:

Write the number

There are 3 zeros between the last non-digit number and the decimal so they are not significant

1 significant digit

5,000

Zeros between the last non-digit number and the decimal are not significant

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.

Answer:

Write the number21.0

Zeros to the right of the decimal are significant

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.

Answer: 5 significant digits

Write the number315.05

3 significant digits to the left of the decimal

2 significant digits to the right of the decimal

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.

Answer: 7.9 pounds

1.27

0.524

3.45

7.944

2 decimal places

2 decimal places

3 decimal places

1 decimal place

Write numbers lining up the decimals

Add (use calculator)

Find the number with the least decimal places

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.

Write formula for volume of cylinder

Replace r with 4.125 in

V = (4.125 in )2

Replace h with 3.5 in

3.5 in

Follow order of operations P E MD AS

Evaluate (4.125)2

V = 17.0156 in2 3.5 in

Use the correct number of significant digits to find the volume of the cylinder.

Multiply numbersV = (4.125 in )2 3.5 in

V = 17.0156 in2 3.5 in V = 187.0965 . . .

Multiply units

in3

Determine number with the least significant digits

3.5 has 2 significant digits, so round answer to 2 significant digits

V = 190 in3 Answer:

Use the correct number of significant digits to find the volume of the rectangular prism.

Answer:

*

Assignment

Lesson 7:9Measurement: Precision

and Significant Digits14 - 37 All