number 8125568 to four significant

To express the number 8125568 to four significant figures, we focus on the first four digits, which are 8125. The fifth digit is 5, prompting us to round up. So we write it as 8126 followed by the appropriate number of zeros to retain its place value, resulting in 8,126,000. When dealing with significant figures, remember to consider any leading zeros irrelevant. For example, numbers like 0.0045 also need to be carefully treated, where only the 4 and 5 count as significant!