Question

Round the following number to 5 significant figures. 20.5625​

Answer 1

The number has 5 significant figures as 20.562

Explanation:

As we know, according to significant figure rules, if the last digit is 5 or less than 5 then it is rounded off as zero.

However, if the last digit is more than five then the digit is put in place to be rounded off.

Example:

20.5628 will be 20.5630 or 20.563

Here, in this case, the last digit is 5 or less than 5, so the last digit is rounded off to zero.

Hence, the number has 5 significant figures as 20.562.

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Answer 2

Answer:

The number 20.5625 is rounded to five  significant figures as 20.562.

Explanation:

• Significant figures are the number of digits that add to the correctness of a value, frequently a measurement. The first non-zero digit is where we begin counting significant figures.

Given , 20.5625

• Here we can see that , zero is between two significant figure . And we know , zeroes between the significant are also significant .
• According to significant figure rules, if the last digit is 5 or less than 5 then it is rounded off as zero.

Hence  , the number 20.5625 is rounded to five  significant figures as 20.562.

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