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.
6276 as a significant figure would be 4 significant figures.
0.000892 to 1 significant figure is 0.0009 (1st significant figure is the first non-digit from the left, where in this case you can omit the number 2 since it will make no difference to the answer)
654 rounded to one significant figure becomes 700.
There is one significant figure in 0.3.
The first significant figure of 0.000169 is the 1 and it has 3 significant figures.
The first significant figure is the leading 2 but, to one sig fig, the number is 30000.
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.
4
2,000
It is then 30,000 rounded to 1 significant figure
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
37.753 rounded to one significant figure becomes 40
In 10.00, the first significant figure is the "1", and the last significant figure is the last "0", because zeroes to the right of the decimal are significant. The two central zeroes are also significant because they are between significant figures, so 10.00 has 4 significant figures.
0.027 The first significant figure is the first non-zero digit from the left hand end. So the first two significant figures are 0.026, however, the third significant figure is 7 which is 5 or more, so the 0.026 is rounded up to 0.027.