 Hi and welcome to the session today. We will learn about whole numbers So first of all let us see what are natural numbers? The numbers one two three four and so on which we use for counting are known as natural numbers Now let's see. What is the successor of? Of a whole number to get the successor of a natural number We add one to the natural number for example successor five is given by five plus one which is equal to six Now let's see What is the predecessor of a natural number? to get the predecessor of a natural number we subtract one from the given natural number for example predecessor is Equal to five minus one that is four now we can say That every natural number has a successor every natural number except one Has a predecessor Now let's see what are whole numbers natural numbers Along with zero from the collection of whole numbers That is zero one two three Four and so on are the whole numbers Now again, we can say That every whole number Has a successor Now the predecessor of one will be zero so every whole number except zero Has a predecessor now. Let's move on to our next topic number nine Draw a line like this and now mark a point on it and label it as zero Now mark a second point on the right of zero and label it as one Now the distance between zero and one is called the unit distance Now on this line mark another point on the right of one at a unit distance That is the distance between zero and one and one in this point should be same and label it as Two mark another point on the right of two at a unit distance and label it as three Now we will keep on labeling the numbers four five six seven eight Nine and so on. Oh, this is the number line for whole numbers Notice that on the number line number eight lies on the right of number five Also, eight is greater than five Similarly number six lies on right of number one also six is greater than one So from this we can conclude that the whole number on the right on the number line is Greater or we can also see that whole number on the left on the number line is smaller The number five lies on the left of number eight also five is less than eight Same way number one is less than number six and it is on the left of six That means whole number on the left is smaller Now let's see how to add two whole numbers on the number line Suppose we want to add two now first of all, let us draw the number line So here is the number line now. We want to add two and five. So first of all, we will start with two Here is the number two the number two So we will make five jumps on the right of two That is from two to three three to four four to five five to six and six to seven So we read at the point seven that means two plus five is equal to seven Now let's see how to subtract two numbers on the number line We want to subtract three from eight So let's draw the number line Here we want to subtract three from eight. So we will start with eight So here we have the number eight now we want to subtract three So we will make three jumps on the left of eight that is from eight to seven seven to six and six to five So we reach at the point five That means eight minus three is equal to Next we have Multiplication on the number line was here. We want to multiply two and three So first of all, we will draw the number line Now here we want to multiply two and three So we will start with zero two units at a time because we have first number as Two and we will make so this is our first move Second move and third move. So we reach at the point six. That means two and two three is equal to six And with this we finished this session. Hope you must have understood all the concepts. Goodbye. Take care and have a nice day