45.0 is the 44.981 to 3 significant figures.
8 By definition, all the figures are significant (no rounding off appears to have taken place). There are eight significant figures.
0.00755 Any zeros that are before an additional number do not count. Thus, "0.00" would not count as significant figures. The first significant figure is the "7", with the "5" following it. With the second five (in my answer), "4" was rounded up to "5" because the number behind the "4" was a "6", thus the "4" rounds up.
The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". When 16490 is rounded off to 2 significant figures then the first figure to be discarded is 4. As this is less than 5 then the previous figure (6) is not increased by 1. 16490 to 2 significant figures is 16000.
If the zeros are significant figures then 900 is correct to 3 significant figures. If rounding off has occurred then the answer could be 1 sf or 2sf. For example : If the original number was 903 and rounding off to the nearest ten was required then 900 is correct to 2 significant figures. If the number was 927 and rounding off to the nearest hundred was required then 900 is correct to 1 significant figure.
0.6942 rounded off to 2 significant figures is 0.69
7.0001 rounded off to 4 significant figures is 7.000
155cm rounded to two significant figures is 160cm
111.009 mm rounded off to four significant figures is 111.0
The answer is 0.059 as the four significant figures are 0,0,5,9.
11225 g rounded to 3 significant figures is 11200g
The correct representation when the number 0.007225 is rounded off to three significant figures is 0.00722
9.95
600
8840
1.0e6
599