Are the whole numbers closed under division?
Now observer this table

Confirm it by taking few more examples.

Are the whole numbers closed under subtraction? Your subtractions may be like this: . Take as many examples as possible and check.

Observe the table: Which gas is increased more in exhaled air?

Identifying the electric conductivity of a material: Arrange an electric circuit with a battery and bulb. Close and circuit using an iron nail as shown in figure. Observe whether the bulb glows or not. Record your observations in table Repeat the same experiment using the other samplesa nd record your observation in the same table.

what is prime number.give few examples

Observe the following divisions, give reasons why 8 in the divisor 48 is considered in the above example?

the number of products that can be formed with 10 prime numbers taking two or more at a time is

(Table)You have seen that the product of two natural numbers is one or more than one bigger than each of the two natural numbers. For example, 3xx4 = 12, 12gt4 and 12gt3 What happens to the value of the product when we multiply two proper fractions Fill the following table and conclude your observations.