 in multiplication of this right, say significant digits or numbers, figures, as in the original number having least number of significant figures, does it make sense for significant figures? Significant figures, okay, so let's take those masses, don't use the calculator though, centimeter in the density gram per centimeter cube, please find out the answer. Let me keep on adding them, okay, so what is the answer? 1.68. 1.68, somebody said 1.68. 8. 6. 8. 8. So what you have done is you have just, so actually when you have done 688 like that, okay, now you have to write 9, it is closer to 69 than 68. Please stop it. Stop talking. Mass is 6 kg and acceleration of an object is 3 meter per second square. You need to find total force acting on it, how much? Uncertain about the last digit. Something else, okay, so your significant is a sum of certain digit and uncertain one. Final result should retain as many decimal places in the number with the least decimal place. It should retain how much? So let's take 1.32 gram, these three masses scale. So how much should be the reading? 7.08. 7.08. 7.08. 7.08. 7.08. You should discard the second going forward. So we did like 2, 1.688, okay. So there are physical rules out there, nothing, let's say. But let's study those as well systematically. Write down just one decimal place, what should it be? 2.8. So this will be 2.8. What if it is 2.775? 2.8. 2.865. So number preceding to 5 is an odd number. Then you make it 3 right off. 5 is? 5 is odd in the big law. It's not logical or like, it's not, it has some of this chapter. It is never ending, okay, but this chapter.