Splash Screen
Example 9-5b Objective Analyze measurement
Example 9-5b Vocabulary Precision The precision of a measurement depends on the unit of measure. The smaller the unit, the more precise the measurement is
Example 9-5b 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
Lesson 9 Contents Example 1Identify Precision Units Example 2Identify Significant Digits Example 3Identify Significant Digits Example 4Add Measurements Example 5Multiply Measurements
Example 9-1a Identify the precision unit of the thermometer. 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 2 Add dimensional analysis Answer: degrees
Example 9-1b Identify the precision unit of the ruler. Answer: inch
Example 9-2a 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
Example 9-2a Determine the number of significant digits in the measure 30,080 feet. Answer: 4 significant digits
Example 9-2b Determine the number of significant digits in the measure 21.0 miles. Answer: Write the number 21.0 Zeros to the right of the decimal are significant 3 significant digits
Example 9-2b Determine the number of significant digits in the measure 4, miles. Answer: 6 significant digits
Example 9-3a Determine the number of significant digits in the measure ounces. Answer: 5 significant digits Write the number significant digits to the left of the decimal 2 significant digits to the right of the decimal
Example 9-3b Determine the number of significant digits in the measure centimeters. Answer: 5 significant digits
Example 9-4a MAIL Venita took four packages to the post office. They weighed 1.27 pounds, 3.45 pounds, pound, and 2.7 pounds. Write the combined weight of her mail using correct precision. Answer: 7.9 pounds 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
Example 9-4b 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
Example 9-5a Use the correct number of significant digits to find the volume of the cylinder. Write formula for volume of cylinder Replace r with 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 = in 2 3.5 in
Example 9-5a Use the correct number of significant digits to find the volume of the cylinder. Multiply numbers V = (4.125 in ) 2 3.5 in V = in 2 3.5 in V = Multiply units in 3 Determine number with the least significant digits 3.5 has 2 significant digits, so round answer to 2 significant digits V = 190 in 3 Answer:
Example 9-5b Use the correct number of significant digits to find the volume of the rectangular prism. Answer: *
End of Lesson 9 Assignment Lesson 7:9 Measurement: Precision and Significant Digits All