Significant Figures and Scientific Notation

Identify the number of significant figures in the measurement 123.45.

• 3

• 4

• 5

• 6

Answer explanation

The measurement 123.45 has 5 significant figures because all non-zero digits are considered significant, and the zero between the digits 3 and 4 is also significant.

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DOK Level 1: Recall

Multiply 6.022 by 0.10 and express the answer with the correct number of significant figures.

• 0.6022

• 0.60

• 0.6

• 0.602

Answer explanation

To multiply 6.022 by 0.10, we get 0.6022. Since 6.022 has 4 significant figures and 0.10 has 1 significant figure, the answer should have the least number of significant figures, which is 1, making the correct answer 0.6.

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DOK Level 2: Skill/Concept

A measurement is recorded as 0.00340 m. How many significant figures does this measurement have?

• 2

• 3

• 4

• 5

Answer explanation

The measurement has 3 significant figures because all non-zero digits are considered significant, and the zeros between the non-zero digits are also significant.

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DOK Level 1: Recall

Match the correct number of significant figures to the number: 600.0

• 1

• 2

• 3

• 4

• 5

All digits are significant when written in scientific notation as part of your coefficient.

• True

• False

How many significant digits in the number 4.100 x 10⁶ meters?

• 2

• 4

• 6

• infinite

How many significant figures does the following number have: 0.00204

• 6

• 4

• 3

• 2

Match the correct number of significant figures to the number: 4.300

• 1

• 2

• 3

• 4

• 5

Match the correct number of significant figures to the number: 0.03

• 1

• 2

• 3

• 4

• 5

Match the correct number of significant figures to the number: 8000

• 1

• 2

• 3

• 4

• 5