 Okay, so it says calculate the following expression to the correct number of significant figures. And it gives you 1.3 or 2.3 times 10 to the sixth multiplied by 8.35 times 10 to the fifth. And then multiply that by 5.39 times 10. So what is the answer to this expression? So how do I do this? I just go ahead and multiply all three of those numbers like how they are. And what I would get here is the same number of significant figures as the lowest one of those numbers. Each one of these numbers has 1, 2, 3, 1, 2, 3, 1, 2, 3 significant figures. So the answer itself is going to have three significant figures. So 5.54 to the 17 to win the three significant figures. So let's do the same problem but we'll add those three together and see what the different answer or the significant figure wise is. Okay, are there any questions on this one? Pretty straightforward I think since we've been doing these other things.