Unit Conversions and Significant Figures

Are you enjoying the video lesson?

• Yes

• No

Which of the following is an example of an exact number?

• The speed of a car measured by a speedometer.

• The weight of a person on a scale.

• The number of eggs in a dozen.

• The length of a table measured with a ruler.

What two pieces of information do measured numbers convey?

• The number that was measured and the units of measurement.

• The number that was measured and the precision of the measurement.

• The number that was measured and the person who measured it.

• The number that was measured and the time of the measurement.

How would 60 miles per hour, known to two significant figures, be expressed in scientific notation?

• 6 x 10^1 mph

• 6.0 x 10^1 mph

• 60.0 x 10^0 mph

• 0.6 x 10^2 mph

When adding or subtracting numbers, what determines the number of significant figures in the answer?

• The total number of significant figures in all numbers being added or subtracted.

• The number with the fewest significant figures overall.

• The number with the fewest figures after the decimal point.

• The number with the most figures after the decimal point.