A normal saline solution is 0.9% sodium chloride. Express that percent as a decimal.

Rationale

0.009 is the decimal representation of 0.9%.

To convert a percent to a decimal, you must divide the percentage by 100. This is because the word "percent" means "per 100." In this case, dividing 0.9 by 100 gives us 0.009.

A (0.09) YOUR ANSWER

This choice represents a misunderstanding of the conversion from percent to decimal. Dividing by 100 will always move the decimal point two places to the left. Therefore, 0.9% becomes 0.009, not 0.09.

B (9) YOUR ANSWER

This option suggests a complete misunderstanding of the conversion from percent to decimal. The value 9 is 900% when expressed as a percentage, which is far greater than 0.9%. The correct conversion of 0.9% is 0.009.

C (0.009) CORRECT

This is the correct answer. Dividing 0.9 by 100 yields 0.009, correctly representing 0.9% as a decimal.

D (90) YOUR ANSWER

This choice indicates a misunderstanding of the conversion from percent to decimal. The value 90 is 9000% when expressed as a percentage, which is significantly greater than 0.9%. The correct conversion of 0.9% is 0.009.

Conclusion

To convert a percentage to a decimal, the percentage value must be divided by 100. In the case of 0.9%, the result of this division is 0.009. Therefore, 0.009 is the correct decimal representation of 0.9%. The other options represent common misconceptions about the process of converting percentages to decimals.

A normal saline solution is 0.9% sodium chloride. Express that percent as a decimal.

0.009 is the decimal representation of 0.9%.

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