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Twenty one millionths in standard form is written as 0.000021. This is because each place value after the decimal point represents a power of 10 that is negative. In this case, the digit 2 is in the hundred thousandths place, the digit 1 is in the millionths place, and the rest are zeros.

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Wiki User

11y ago

Twenty one millionths (0.000021) in standard form is 2.1 × 10-5

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Q: What is twenty one millionths in standard form?
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