Q: What is significant about the number 21?

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If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The number 805 has three significant figures.

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2 of them.

100(21/45) = 47 %, to the justified number of significant digits, like dogs in this sample.

Nothing particular. It is a triangular number but so are infinitely many other numbers. It is a semiprime but again, so are infinitely many.

There are 2 significant digits in the number.

If the conversion factor is exact, then the number of significant figures in the answer is the same as the number of significant figures in the original number.If the conversion factor is an approximation, then the number of significant figures in the result is the lesser of this number and the number of significant figures in the original number.

The significant number, which defines the order of magnitude of the number is 9000.

the significant number is 592.515. i checked on a calculator.