45.0
3.41 → 3 to one sig fig
3050
35164 is 35200 rounded to 3 significant figures. To round to 3 sig fig, use the 4th digit to decide whether to round up or down; digits after the first 3 are replaced by zeros: 4th digit is 6, so round up 35164 → 35200 to 3 sig fig.
if not specified you do it to the lowest no. sig. fig. in the original equation. if you are only given 1 (not 1.000 i.e.) then do it to 1 sig. fig. in practice though, could get away with 3 sf because you will not be penalised for it
As trailing zeros after a decimal point are not normally written, for them to be written means they must have significance, so 4.270000 has 7 significant figures (it may have been rounded from 4.2699995 to 7 sig fig). 4.27 (the same value) would only have 3 sig fig.
It depends to how many significant figures: 1 sig fig => 10 (technically 1 x 101 or 1e1) 2 sig fig => 13 3 sig fig => 12.7 4 sig fig => 12.74 5 sig fig => 12.744
3.41 → 3 to one sig fig
3050
3 sig figs
35164 is 35200 rounded to 3 significant figures. To round to 3 sig fig, use the 4th digit to decide whether to round up or down; digits after the first 3 are replaced by zeros: 4th digit is 6, so round up 35164 → 35200 to 3 sig fig.
When you've finished operating on your numbers to round to 3 sig fig you want to round to the first three digits starting with the first non-zero digit by using the fourth digit (as normal) and then replace all further digits to the right by zeros and removing any digits so changed to zero after a decimal point. Examples: 12345 to 3 sig fig is 12300 since the 4 does not round up the 3. 124578 to 3 sig fig is 125000 since the 5 rounds up the 4. 0.1234 to 3 sig fig is 0.123 since the 4 does not round up the 3 and the trailing zeros (created) are removed. 0.001234 to 3 sig fig is 0.00123 12984 to 3 sig fig is 13000 since the 8 rounds the 9 up. 0.012984 to 3 sig fig is 0.0130 since the 8 rounds the 9 up. 3333333333.33 to 3 sig fig is 3330000000
73.02 → 73.0 to 3 sig fig.
0 (there are no numbers after the decimal point) * * * * * Wrong answer! But there is no simple correct answer. Integers ending in 0 are ambiguous cases. It is not possible to say whether the number 8700 represent a value that has not been rounded (4 significant figures), rounded to the nearest ten (3 sig fig) or to the nearest hundreds (2 sig fig).
if not specified you do it to the lowest no. sig. fig. in the original equation. if you are only given 1 (not 1.000 i.e.) then do it to 1 sig. fig. in practice though, could get away with 3 sf because you will not be penalised for it
In 356 there are 3 sig fig.
0.882 has 3 sig fig.
156000 has 3 sig fig.