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hello children in today's maths class we will learn how to fill in the placeholders by addition and subtraction fill in the placeholders now children can you see these two boxes yes we have to fill them up by adding two numbers to make it into number seven but which number to fill it up so that we will get number seven the first thing we need to do is to draw seven lines so let's draw seven lines one two three four 5 6 7 after making seven lines we need to break the lines into two parts by putting a plus sign children we can put plus sign anywhere between these seven lines all right so if i put plus sign here then it breaks into two parts now we will first count the left side and then put this in the first box one two now we'll put this number in the first box next let's count the right side one two three four five and put this number in the second box therefore two plus five equals to seven let me repeat one second children first step is to draw the lines of the given number all right second step is to separate the lines by putting a plus sign and the third step is to count the numbers separately that is on the left side and on the right side by putting the numbers in each boxes all right children now children let's try another sum all right tell me children first what we need to do yes we need to draw the lines how many lines do we need to draw that's right nine lines so we will draw nine lines one two three four five six seven eight nine after that what do we need to do we need to break the lines by putting a plus sign children we can put a plus sign anywhere we want all right so let me put the plus sign here now the lines are separated into two parts so let's first count the left side one two three four and put the number four in the first box now let's count the right side one two three four five and put it in the second box all right therefore four plus five equals to nine all right children let's do one last sum of addition all right first we need to draw how many lines six lines one two three four five six and put a plus sign anywhere so let me put it here let's count the left side one two and put this number two in the first box now let's count the right side one two three four now i'll put it in the second box therefore two plus four equals to six i hope everyone is clear with the addition placeholders yes okay next let's proceed to subtraction placeholders all right now we will learn how to fill in the placeholders by subtraction all right children look at these two boxes yes in these two boxes we need to put two numbers to get number five so children which two numbers we should subtract to get number five the best way to do is we need to draw a number line all right in this number line we can pick any number which is bigger than number five suppose if i pick number seven and circle it we will put this number seven in the first box all right now which number we should subtract from number seven to get the answer five to get an answer five we have to do backward counting five times all right let's count one two three four five where does it stop it stops at number two so we will put number two in the second box therefore seven minus two equals to five got it children let me repeat it once again first step is to draw a number line second step is to select any number which is bigger than our answer that is 5 and put the selected number that is bigger number in the first box third step is to do backward counting of the given number and circle the number where it stops then put the number in the second box alright now children let's try to do another sum tell me children first what we need to do yes we need to pick any number that is bigger than number three let's pick number 10 now what should we do we need to put a circle at number 10 and put it in the first box after that we will start counting backwards how many times three times one two three so where does it stop it stops at number seven so we will put number seven in the second box all right number seven in the second box therefore ten minus seven equals to three all right children children let's try to do one last sum all right first we will pick any number bigger than number four let's pick number seven now what shall we do we need to put a circle at number seven and put it in the first box after that we will count backward how many times children we will count four times one two three four and it stops at which number yes number three so we will put this number three in the second box therefore seven minus three equals to four all right children children there is another way of doing this all right first we need to pick a bigger number more than 5. suppose if we pick number 10 we need to put number 10 in the first box then how to find the number in the second box instead of doing backward counting we can subtract number 10 with 5 if we subtract number 10 with 5 1 2 3 4 5 6 7 8 9 10 subtract with 5 1 2 three four five how many are left now one two three four five so we will put number five in the second box therefore ten minus five equals to five children we can do in this way also all right by using both addition and subtraction i hope now everyone is clear how to fill in the placeholders yes now children all of you turn to page number 42 and do the same as your classwork