00:02
Okay, here you're talking about significant digits.
00:05
So for the first one, 405 -000 -0.
00:10
Trailing zeros are not significant.
00:14
So you have three significant figures.
00:18
They are zero, sorry, four, zero, and five.
00:23
Looking at number two, this is 0 .0098.
00:28
8.
00:29
So leading zeros are also not significant.
00:33
So the reason trailing and leading zeros are not significant is because we can undo them with scientific notation.
00:41
So when this is incorrect scientific notation, how many digits does it have? so this is two.
00:47
And it is 9 and 8.
00:51
The third one is 39 .1, 2, 3, 4, 5, 6 .9.
00:57
So this is eight significant digits.
01:03
Every digit is significant.
01:05
They are not leading or trailing zeros here.
01:08
So even though that there are six nines, every single one of them is significant.
01:14
Number four is 1300.
01:30
So here this is two significant digits...