Round off the numbers $143.45$ and $143.55$ to four significant figures.... | significant figures Q&A

Source: Extra Practice

Round off the numbers $143.45$ and $143.55$ to four significant figures.

Options

$143.4$ and $143.6$

$143.5$ and $143.6$

$143.4$ and $143.5$

$143.5$ and $143.5$

Explanation

To round off to four significant figures: For $143.45$ , the digit to be dropped is $5$ . The preceding digit $4$ is even, so it remains unchanged, yielding $143.4$ . For $143.55$ , the digit to be dropped is $5$ . The preceding digit $5$ is odd, so it is rounded up by 1, yielding $143.6$ .