1686 rounded to 2 significant figures is 1700
2300
4.5 uses 2 significant figures.
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.
1 mole S = 32.065g 32g S x 1mol/32.065g = 1.0mol S (rounded to 2 significant figures)
Significant figures are very important when it comes to calculations. If the mass of an electron is 9.10939 x 10-31 then its significant figures are: 9 x 10^-31( correct 1 significant figure), 9.1 x 10^-31 kg ( correct to 2 significant figures), 9.11 x 10^-31 (correct to 3 significant figures), and 9.109 x 10^-31 (correct to 4 significant figures).
2.6
2
12
It is 7500 rounded to two significant figures
It is then 0.067 when rounded to 2 significant figures
At least 1 and at most 7. It could be 3,999,999.9 rounded to 7 significant figures; It could be 3,999,999 rounded to 6 significant figures; It could be 4,000,015 rounded to 5 significant figures; It could be 4,000,429 rounded to 4 significant figures; It could be 3,999,999 rounded to 3 significant figures; It could be 4,049,999 rounded to 2 significant figures; It could be 4,492,467 rounded to 1 significant figure.
It is 6.7 when rounded to 2 significant figures
It is 1300 rounded to 2 significant figures
1,430 rounded to 2 significant figures is 1,400
009999991 rounded to 2 significant digits is 1.0e7
2711 rounded to 2 significant digits is 2700
The rules for rounduing off numbers are as follows :- 1) If the first figure to be discarded is 5 or more, then the previous figure is increased by 1. Example : 5.1935 = 5.194 (4sf) = 5.19 (3sf) = 5.2 (2sf) = 5 (1sf) 2) Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure. 1347 . . . when rounded to 3 significant figures then the 7 is discarded so 4 increases to 5. Thus, 1347 becomes 1350 (3sf). When rounded to 2 significant figures it becomes 1400 and to one significant figure 1000.