Express the number 0.0021 as a percent.

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Multiple Choice

Express the number 0.0021 as a percent.

Explanation:
Converting a decimal to a percent means comparing it to 100, so you multiply by 100 (move the decimal two places to the right) and add the percent sign. For 0.0021, moving the decimal two places to the right gives 0.21, so it becomes 0.21%. This matches because 0.21% equals 0.21 divided by 100, which is 0.0021 in decimal form. The other numbers correspond to different decimals: 0.021% is 0.00021, 21% is 0.21, and 2.1% is 0.021.

Converting a decimal to a percent means comparing it to 100, so you multiply by 100 (move the decimal two places to the right) and add the percent sign. For 0.0021, moving the decimal two places to the right gives 0.21, so it becomes 0.21%. This matches because 0.21% equals 0.21 divided by 100, which is 0.0021 in decimal form. The other numbers correspond to different decimals: 0.021% is 0.00021, 21% is 0.21, and 2.1% is 0.021.

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