42 correct to 3 significant figure
To round 42 to 3 significant figures, you need to consider the first three most significant digits.
Here's how you can round to 3 significant figures:
1. Identify the three most significant digits in the number. In this case, the first three digits are 4, 2, and 0.
2. Look at the next digit, which is 0 after the decimal point in this case. If it is less than 5, you leave the last significant digit unchanged. If it is 5 or greater, you round up the last significant digit.
3. Since the next digit after 0 is 0, which is less than 5, the last significant digit will remain the same.
4. The original number 42, when rounded to 3 significant figures, would be 42.0.
Therefore, 42 correct to 3 significant figures is 42.0.