Significant Figures Review

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

How many significant figures are in the number 0.0072?

Back

2 significant figures.

Front

What is the rule for determining significant figures in addition and subtraction?

Back

The result should be reported with the same number of decimal places as the measurement with the least number of decimal places.

Front

What is the rule for determining significant figures in multiplication and division?

Back

The result should be reported with the same number of significant figures as the measurement with the least number of significant figures.

Front

What is an exact number?

Back

An exact number is a value that is counted or defined, having an infinite number of significant figures, such as 100 apples or 1 meter = 100 centimeters.

Front

Convert 7.2 x 10^3 to standard form.

Back

7,200.

Front

What is the rounding rule for addition and subtraction?

Back

Round the result to the least number of decimal places of any number in the operation.

Front

What is the significance of trailing zeros in a decimal number?

Back

Trailing zeros in a decimal number are significant because they indicate precision, e.g., 2.300 has four significant figures.

Front

What is the significance of leading zeros in a decimal number?

Back

Leading zeros are not significant; they only serve to position the decimal point, e.g., 0.0045 has two significant figures.

Front

What is the result of (4.2 + 8.35) x 5.111 + 20 rounded to the correct number of significant figures?

Back

80.