00:01
And compute the final values and round to the approximate significant figures where you have all this.
00:08
So i put up the guidelines for significant figures for us here.
00:13
So we will remember them.
00:15
The first one, whenever you're doing operations to significant figures, adding and subtracting, you try to keep the smallest amount of decimal places.
00:23
In this case, my decimal places are.
00:27
So when i add these two together, i get 10, 12, point 12, i mean 2 .12.
00:35
Done.
00:36
Next one, those two numbers, 3 .4509 times 1 .008200.
00:50
All right, so we get something with a lot of numbers involved we need to keep the approximate amounts these of significant figures.
00:58
Appropriate, i'm sorry, appropriate amount.
01:01
So in this case, whenever you're multiplying and dividing, you keep the significant figures that are less.
01:09
These two values which everyone has need less significant figures, that's what you keep.
01:13
In this case, this guy has less.
01:15
I have five, so my answer should only have five significant figures.
01:21
So we will have 3 .479, so that's four so far, and then one nine, but we're gonna keep it at two because we're rounding it to keep our significant figure count.
01:36
All right, next one, we are dividing, so keep the smaller amount of significant figures.
01:41
In this case, this guy is smaller.
01:43
So let's go ahead and do that.
01:44
4 .3023 divided by 91 .35.
01:54
Oops, 91, not 90, .35.
02:02
I'm running out of room here.
02:03
So i'm just gonna write four here, four to the side.
02:11
.0, so we're keeping how many? we're keeping four significant figures.
02:20
.047 and one, there you go.
02:24
Number five, subtracting.
02:29
So we don't care so much for significant figures, we care about the decimal places.
02:32
In this case, we need three decimal places...