Understanding Significant Figures

What is the main reason for using significant figures in measurements?

• To increase the precision of measurements

• To account for uncertainty in measurements

• To simplify calculations

• To convert units of measurement

Which of the following numbers has 3 significant figures?

• 0.0045

• 4500

• 123.0

• 0.0450

In scientific notation, which part of the number is considered significant?

• Only the digits before the power of ten

• All digits including the power of ten

• Only the digits after the power of ten

• None of the digits

When adding 1.312 kg and 0.45 kg, to how many significant figures should the result be rounded?

• 4 significant figures

• 3 significant figures

• 2 significant figures

• 1 significant figure

If you round 1.05598 to 3 significant figures, what is the result?

• 1.056

• 1.05

• 1.055

• 1.06