 Hello friends. So in yet another session of calculation techniques, we are today going to discuss squaring a number with five at its units place. So while doing lots of physics numericals or any other mathematical calculation, you always end up, you know, in a position where you have to find out, let us say 25 squared. So if you see 25 is, you know, the unit's place is five, right? It is ending with five. This is the unit's place. Now, if such numbers are there, then how do we find out the square very quickly? So the technique is very simple. What you need to do is if there is a number ending with five at its unit place, then the last two digits of the square number will definitely be 25. So plain and simple, right? 25, right? And for the other digits, what you need to do is this is two, right? So hence what you do is you have to multiply two with two plus one, that is three. So you'll get six, isn't it? Now, 25 square will be nothing but 625. Okay. Let us take another example. Let us say we have to find out 25 square. So what will be the answer? So the last two digits will be 25. And for the other digits, you need to simply multiply three with three plus one, which is three into four, which is 12, right? So the other two digits will be 12. And hence the square of 35 is 1225. Okay. Let us take another example. Let us say I have to find out 55 square. So what to do? You now know. 25 will be the last two digits and five will be multiplied by its next number, that is five plus one, which is six. So answer is 3030. So it's just a fix this 30 here. So the square of 55 is 3025. Another one, let us say I have to find out 115 square. So again, do the same thing. 25 will be the last two digits. And here, what is left? 11, right? So 11 into 11 plus one, that is 11 into 12, which is nothing but 132. So the square will be 13225. So take any random number, which is ending with five. Yes, it will be difficult for you to calculate, let us say, 1025 square, because then you have to multiply and you must be very quick in multiplying 102 and 103. If you are able to do this, which will anyways teach you in some other session, then even 1025 square is not that difficult to find out. I hope you learned this technique. The better idea is to take some random numbers, two digit and three digit, ending with five and square it and then see whether it matches with the real right answer. Thank you.