Lesson 11-7 Pages 590-594 Precision and Significant Digits.

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Presentation transcript:

Lesson 11-7 Pages Precision and Significant Digits

What you will learn! 1. How to describe the measurements using precision and significant digits. 2. How to apply precision and significant digits in problem- solving situations.

Precision Significant digits

What you really need to know! The precision of a measurement is the exactness to which a measurement is made.

What you really need to know! Significant digits indicate the precision of the measurement.

What you really need to know! If a number contains a decimal point, the number of significant digits is found by counting the digits from left to right, starting with the first nonzero digit and ending with the last digit.

What you really need to know! If a number does not contain a decimal point, the number of significant digits is found by counting the digits from left to right, starting with the first digit and ending with last nonzero digit.

What you really need to know! When adding or subtracting measurements, the sum or difference should have the same precision as the least precise measurement.

What you really need to know! When multiplying or dividing measurements, the product or quotient should have the same number of significant digits as the measurement with the least significant digits.

Link to Pre-Made Lesson

Example 1: Identify the precision unit of the thermometer shown: 5°F

Example 2: Determine the number of significant digits in the measure. Measurement Significant digits 1,040 miles cm kg Liter 4

Example 3: The sides of a quadrilateral measure 0.6m, 0.044m, 0.24m, and 0.103m. Use the correct number of significant digits to find the perimeter.

Perimeter 0.8 m 1

Example 4: A room is ft wide and 14 ft long. What is the area of the room?

Example 4: A room is ft wide and 14 ft long. What is the area of the room? Area 170 ft 2 2

Page 592 Guided Practice #’s 4-12

Pages with someone at home and study examples! Read:

Homework: Pages #’s all #’s 41-47

Study Guide and Review Pages #’s 1-32 (Odd answers in back of book)

Prepare for Test! Page 599 #’s 1-20

Prepare for Test! Pages #’s 1-20

Page 752 Lesson 11-7