If the digit being removed is greater than five, then we the preceding number increases by one. This is traditional rounding rules. You've been rounding like this ever since you were in middle school. So let's look at an example. This number here has four significant figures. Each one of these digits is significant. There are no zeros. Each digit is significant. So we want to round this to three significant figures. So we're going to be looking at this seven. That is our last significant figure. we have to do something to it because we're getting rid of a nine. And since this nine is greater than five, we round the seven up to an eight. And that's what I said here. And we end up getting 5.38. This is traditional rounding rules. We don't really, this shouldn't come as a surprise to anybody. If the digit being removed is less than five, the preceding number stays the same. Also, traditional rounding rules. We've been using these ever since we were in middle school. So let's look at the number 0.2413. This has four significant figures. This zero is not significant, but all of these digits are. So we want to keep we want to we're looking at this one. It is our last significant digit. And we're getting rid of a three. Since this three is less than five, we don't have to do anything to this one. We just leave it alone. And we end up with 0.241 as our final number. And there are a total of three significant figures here. Now, what happens if the number that we're taking away that we're dropping is five. The rules go as this. If the pre the preceding number is increased by one, if it is odd and it remains the same if it is even. So, an easy way to remember this is chemists like things even. If whatever is left over after you remove the five is odd, you make it even and you round up. If it is even, you leave it alone. So, let's look at two examples. 17.75. Let's round that to three sigfigs. We're taking away a five. The seven is odd. So, what we're going to do is we're going to round that up to the next nearest even number, which would be eight. And so, we end up getting 17.8. On the flip side, 17.65. If we remove this five, the six is even already. So we don't have to do anything with it. It is proper the way it is. So we we can just leave that alone and our final answer would be 17.6. This is a very special rule that only chemists use. I've never seen it used by anybody else. So if you remain in chemistry, you will use it regularly. If you move on to engineering, they will have different rules associated with rounding the number five.