Significant Figures and Notation

In this video tutorial, Professor Marconi Santos introduces the concept of significant figures and demonstrates how to solve problems related to them. The video is divided into sections, starting with an introduction and a detailed explanation of the first question involving the sum of numbers with significant figures. The second section covers the analysis of significant figures in various numbers, providing insights into the rules and exceptions. The final section offers practical guidance on writing numbers with a specified number of significant figures, using examples to illustrate the process. The tutorial aims to enhance understanding and application of significant figures in mathematical calculations.

What is the sum of 28.7 and 1.03 when considering significant figures?

• 29.7

• 29.73

• 29.04

• 30.0

Why do we consider 7 and 3 as uncertain digits in the sum of 28.7 and 1.03?

• Because they are whole numbers

• Because they are the first digits

• Because they are in the decimal places

• Because they are the last digits

How many significant figures are in the number 27.01?

• 3

• 5

• 4

• 2

Which of the following numbers has only two significant figures?

• 0.0020

• 100.0

• 2030

• 9.99

How many significant figures are in the number 100,000?

• 4

• 3

• 2

• 1

What is the correct way to write 25.45 with three significant figures?

• 25.4

• 25.450

• 25.5

• 25.45

How would you write 2.45 with two significant figures?

• 2.4

• 2.450

• 2.5

• 2.45

If a number has six significant figures, how many should be kept if only five are required?

• The last five

• Any five

• All six

• The first five

What is the correct way to write 85.2 with two significant figures?

• 85

• 85.0

• 85.20

• 8.52

How would you write 62.25 with three significant figures?

• 62.25

• 62.2

• 62.3

• 62.250