Express 0.9% as a decimal.

Rationale

0.9% as a decimal is 0.009.

To convert a percentage to a decimal, one must divide the percentage value by 100. Thus, 0.9% becomes 0.9 divided by 100, resulting in 0.009.

A (0.009) CORRECT

This option correctly represents the decimal conversion of 0.9%. When you divide 0.9 by 100, you place the decimal two places to the left, yielding 0.009.

B (90) YOUR ANSWER

This choice represents a misunderstanding of percentage conversion. The number 90 is simply 90% expressed as a whole number, not as a decimal. To convert 90% to a decimal, one would divide by 100 to get 0.90.

C (9) YOUR ANSWER

Choosing 9 also indicates confusion with percentage conversion. The number 9 is not equivalent to 0.9% but rather represents 900% when considered in decimal form (9.0). Dividing by 100 yields 0.09, which is still incorrect for 0.9%.

D (0.09) YOUR ANSWER

This choice represents 9% in decimal form, as moving the decimal point two places to the left for 9 results in 0.09. However, it does not accurately reflect the conversion of 0.9%, which is 0.009.

Conclusion

To convert a percentage to a decimal, the correct approach is to divide by 100. In this case, 0.9% translates to 0.009, making option A the correct answer. The other options demonstrate common errors in understanding percentage-to-decimal conversion, highlighting the importance of the correct mathematical process.

Express 0.9% as a decimal.

0.9% as a decimal is 0.009.

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