 Hello and welcome to the session. In this session we will discuss a question which says that choose the rule of the size measurement. First part is 8 inches 8.3 inches. Second part is 80 feet. Now let us start with the solution of the given question. Let us start with the first part. Now in the first part two measurements 8 inches and 8.3 inches are given to us and we want to find the more precise measurement out of these two given measurements. Now here we can see that both measurements have same units that are inches. So to know more precise measurement we will see the greatest possible error in both measurements. Now in 8 inches the last significant digit that is 8 is at unit space possible error will be half of the position of the last significant digit that is 1. So this is equal to 1 by 2 which is equal to 0.5. So here the greatest possible error is equal to 0.5. Now in second measurement that is 8.3 inches the last significant digit is 3. It is at position 0.1 that is one tenth. Hence greatest possible error is equal to 1 by 2 into 0.1 which is equal to 1 by 2 into 1 by 10 that is equal to 1 by 20 which is equal to 0.05. The greatest possible error is equal to 0.05. Now 0.05 is a smaller error then 0.5 point with smaller error will be more precise that means 8.3 inches is more precise measurement then 8 inches. Now let us start with the second part. The second part 2 measurements 4 yards and 18 feet are given to us and we want to find the more precise measurement out of these 2 given measurements and we will see the units of both the measurements. Now both measurements have different units that is yards and feet. Now a foot is a smaller unit of measurement than a yard so 18 feet is more precise measurement then and that's all for this session. Hope you all have enjoyed the session.