hi everyone i'm bella welcome to my youtube channel in this video i will share with you from 4 chapter 2 number best let's start before we start this chapter all the number that we know from our primary no should be kindergarten o is in the number of best ten so from this chapter we want to introduce you actually the number can represent in different numbers so all the numbers here we call it as the number and this is we call it as the best okay so the best got two three four five six until 10 so the number that we know before this is all in best ten so how about the number with the best two all the number in the number best 2 is only got the digit 0 and 1 and for the number with number base 3 the digit includes 0 1 2 and for the number for best for the digit include zero one two three and so on okay for number best five six seven and nine okay so let me give you an example for 213 okay we know that this 3 for the plus value of the 3 is 1 and the plus value for this one is 10 and the plus value for this 2 is 200 this is what we learned from primary okay how about the digit value the digit value for this three since this is one so we were one times three the digit value is three how about the digit value for this one this is 10 the plus value is 10 so we will use 10 times 1 so the digit value will be 10 and how about these two the place value is hundreds so we will use 100 times two so the digit value for this two is 200 then the last part is the number value of this number so we'll add on all the digit value here 200 plus 10 plus 3 so it is 2 1 3 with the best 10. let us go and see how can we change the different number bets to best 10 okay this is one of our learning tasks okay how can we change the different best to best 10 for example from best 2 to best hand from best 5 to best 10 or best 9 to best 10 okay let us go to the example one determine the value of each of the following so we have to change the best 2 to pass 10 so i will do like this 1 1 0 1 and here is the plus value for the plus value of this one since this is best 2 so the plus value will be 2 power 0 and for this place value it will be 2 power of 1 this will be 2 power of 2 this will be 2 power 3 this is the plus value okay and how about this digit value the digit value of this one is 2 power 0 times 1 and how about this 2 power 1 times 0 this is 2 power 2 times 1 2 power of 3 times 1 and the last part will go to the number value we will add all this up okay so 2 power of 3 times 1 we will get 8 and 2 power of 2 times 1 will get 4 2 power 1 times 0 will get 0 2 power 0 is equals to 1 times 1 is still 1 so we'll add up all these and we'll get our answer is 13 with best 10 so this is the way how we change from number best 2 to number best 10 okay let me show you one more example okay four three two with the number best five okay let's see four three two all the process is the same the first thing you have to find your plus value since this is best 5 so this will be 5 power of 0. we will always start with 0 okay 5 power 1 5 power of 2 and then we will go and find the digit value 5 power of 0 times 2 5 power 1 times 3 5 power 2 times 4 the last part we are going to find the number value 5 pi over 2 times 4 is equals to 100 5 power 1 times 3 is equal to 15 5 power 0 is equal to 1 times 2 is equals 2 after we add it up we'll get 117 with the number of best 10. after we know how to change the different number best to best 10 then we will proceed to learn how to change the number with best hand to different number of bets let's see example two convert each of the following numbers to number in best standard so we have to change the number of best 10 to number of best five we will write down this 32 and then we will divide the number of bets that we want okay let's say you want best five then you will divide five if you want the best is best at then you are right four one three divided by so depends on what number best you want okay so now we want to divide by five so five times six is equals to 30 right so the remainder is three so we'll write here the remainder is three then we will continue divide with five okay five one is equals to five so six times five the remainder is still one okay we will continue until zero five zero is equals to zero so the remainder is one will stop when is equals to zero so from here we will look at the number from down here until up here so my final answer is one one three with best 5 the number best the i1 okay let us go to the part b ok so at time 51 we will get 408 right so the remainder is 5 and i will continue divide by f 8 times 6 is equals to 40 and the remainder is 3 i will continue divide by 8 at 0 is equal to 0 and the remainder is 6. so my final answer i will look from down here until the up here so it's 6 3 5 with the best at now we go to the part 3 which is changing from different mass to different mass for example we want to change the batch tree number to best seven so what is the process then i will change from batch three to best ten before i go to best seven okay how can we change from from best three to past ten which i have already said here we will use this way okay so i will start with 3 power 0 times 2 plus 3 power 1 times 2 plus 3 power of two times zero plus three power of three times two plus three power of four times one this will be the value i get with the best ten okay now i will get my answer is 1 4 3 with best 10. after i get the number with best 10 then i will use the way i teach you to change it to the number best 7 so i will use the 143 divide by seven so i will get 20 here and the remainder is three so i will continue divide by seven seven two is equals to fourteen so the remainder is six then i will continue divide by seven again until it goes to zero the remainder is two so my final answer is two six three with the best seven okay now we go to the part b we want to change the number best nine to number best five so the same process will go to number best 10 first before we proceed to number best five okay so this is 9 power of 0 times x plus 9 power 1 times 4 then i will get my answer okay for the x of number of rest nine i will get my answer is 44 with best 10 after i get the number with best 10 i will divide by 5 what is 5 because i want it become best five okay i will divide it by five and five is equals to 40 so the remainder is 4 i will continue divide by 5 and i will get the remainder with 3. i will continue with 0 and i will get the remainder is 1. so 1 3 four with the number best five the last part is teaching how you change the number with best two to best at or in the reverse way okay now let's see example four and this table i will use this table to change the best two number directly to the best ad okay so let's see one one zero well well c three digit by three digit okay one one zero from this table with the best two because here is best two let's see which one is one one zero is here the number is six so i will put six here and here is one one all the digits here is three digit okay so i will add on a 0 in front so it becomes 0 1 1 oh wait is that 0 1 1 is here it's 3 then i will directly you say is 36 with best ad okay we'll use this table and how about this one okay let's see one with the best add okay i will i will go to here by set one here zero zero one zero zero one okay this is zero zero is zero zero zero okay i will write down zero zero zero with seven one one one one one one with past two okay by using table the second way is by using the calculator take out your calculator and let us try okay the first thing you have to press on the mod one two until you see this best okay then you press three okay here you will see the d at here okay what does this mean d means let's see most okay let's see here here got a b i n right here okay b i n means binary binary means is best to okay here got o c t all c t means is uh the best at okay and how about the d d is here did you see d e c means decimal okay d e c means decimal so now i want is 1 0 1 1 0 1 1 1 0 1 again 1 0 1 again ok but i want it to be in binary okay i will change it to binary i will press this binary then you will see the small one become b okay that's mean binary then i will press enter okay so 1 0 1 1 0 1 that means in number of best two now i want to change it to best app best ad i will directly press press the oct press 55 you see the small little orbeez behind it okay so it's 55 of fast f let's say if i want to change it to best 10 i will press the decimal press it become 45 with best 10. do you see that let us check with the table ok ok 1 0 1 1 0 1 5 okay it's 5 1 0 1 5 again you see it's the same okay let us use this okay okay 17 17 but this is in bass add so i will put the o here then i will press enter so i will make sure 17 with the best ad okay now i want to change to binary okay i will press the binary here then it will become one one one one with best two let's say i want to change to decimals best 10 is 15 with best hand let us check with the table okay seven on that set seven one one one so this is one one one and one one here zero zero one zero zero one so you see you also can use your calculator to find your answer for the best two best and best hand now let us go to the addition pad okay two three three one with with best four two three zero with best four we want to add it up okay one plus zero is equals to one okay three plus three is equal to six can we write six here cannot why because the higher digit for the best four is three okay so after we get six we have to minus of four okay so we just left two here but don't forget we have to plus one here one plus three plus two is equal to 6 again we have to minus of 4 then we left 2 here and don't forget the plus 1 here then i will get 3. can we write 3 in here can we can so this will be my final answer okay let's see one more example three two four with best five two three one with best five okay four plus one is equals to five can we write five right here um seems like cannot because the higher digit is equal to four okay so five i will minus of five then it will become zero okay zero but don't forget when you minus off you will plus one here okay one plus two plus three is equal to six with minus of five then our left one is here and plus one here okay three plus two plus one is equal to six again with minus of five and left one here and plus one here okay there we go this will be our final answer okay let's proceed to the last example four five five with best seven and forty three with best seven five plus three is equals to eight so we have the minus of seven now we left one here and we add one here okay one plus five plus four is equals to ten then we were minus of seven now we are left three and here so we still have the plus one here one plus four is equal to five can we write 5 here 10 because the higher digit for number by 7 is until 6 so we can write 5 here with number best 7. now we go to the last part which is subtraction for part a two zero three four minus of one four two with the number best five okay four minus two we get two it's very easy three minus four can we do this no we cannot we have to borrow from here but here is zero can we grow from here cannot so we have to getting help from here okay so this is become one what value will be this zero become it will become five not ten is five okay because the number best is five after that we can borrow to the three we will become four and i will borrow five to the three five plus three is equals to x so now at k minus four yes we can at minus four i will get four here four minus one i will get three one minus zero i will get one so my final answer is one three four two with best five okay now let's go to the part b one two four we press at fifty six with best x okay four k minus six cannot so i will borrow from the two so these two will become one how much i borrowed to the four is it because the best is best at okay so add plus 4 is equal to 12 12 minus 6 we will get 6 here 1 10 minus 5 no we cannot so i will borrow from here becomes 0 how much i borrow to this one 8 so 8 plus 1 is equals to 9 9 minus 5 equals to 4 we pass it okay for the last example 1 two one zero with best three okay twenty one five three zero k minus one no we cannot so we have to borrow from here so this one becomes three y is three because the best is three the number bus is three okay three minus one is two zero k minus two no so this one becomes one and this one will become three three minus two is equal to one and one here one here so okay that's all hope this video able to help you to understand more about number best do remember to like share and subscribe my youtube channel bye [Music]