2. Splash Screen

3. Example 9-5b Objective Analyze measurement

4. 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

5. 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 150. 150.00

6. Lesson 9 Contents Example 1Identify Precision Units Example 2Identify Significant Digits Example 3Identify Significant Digits Example 4Add Measurements Example 5Multiply Measurements

7. 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

8. Example 9-1b Identify the precision unit of the ruler. Answer: inch

9. 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

10. Example 9-2a Determine the number of significant digits in the measure 30,080 feet. Answer: 4 significant digits

11. 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

12. Example 9-2b Determine the number of significant digits in the measure 4,700.00 miles. Answer: 6 significant digits

13. Example 9-3a Determine the number of significant digits in the measure 315.05 ounces. Answer: 5 significant digits Write the number 315.05 3 significant digits to the left of the decimal 2 significant digits to the right of the decimal

14. Example 9-3b Determine the number of significant digits in the measure 35.006 centimeters. Answer: 5 significant digits

15. Example 9-4a 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 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

16. 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

17. 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 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 in 2  3.5 in

18. 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 =   17.0156 in 2  3.5 in V = 187.0965... 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:

19. Example 9-5b Use the correct number of significant digits to find the volume of the rectangular prism. Answer: *

20. End of Lesson 9 Assignment Lesson 7:9 Measurement: Precision and Significant Digits 14 - 37 All