The first significant figure is the leading 2 but, to one sig fig, the number is 30000.
It is the first figure that's not a zero. This applies to all numbers.
The first significant figure of 0.000169 is the 1 and it has 3 significant figures.
0.019 to 1 significant figure is 0.02 (significant figure is counted from the left with 1st significant being the first non-zero from the left)
The number 327 to one significant figure is 300. The digit 3 is the first and only significant figure, and numbers after this digit are considered not significant.
849 to 1 significant figure is 800. This is because the first non-zero digit is 8, so the significant figure is the hundreds place.
The significant figure of a number refers to the non-zero digits and any zeros that are between them or at the end of the number. In the number 257166, the first significant figure is 2, as it is the first non-zero digit in the number.
To express 0.00628 to one significant figure, we focus on the first non-zero digit, which is 6. Thus, 0.00628 rounded to one significant figure is 0.006.
2,000
4
It is then 30,000 rounded to 1 significant figure
0.00245 rounded to one significant figure is 0.002. The first significant figure is '2,' and all digits to the right are replaced with zeros. The leading zeros before the '2' do not count as significant figures.
The first significant figure is the first number which is not zero (in this case, it is the three). All numbers beyond this are significant. So the third significant figure is the 9. In this case, the number rounds down to 0.0309