 Hi, this is Chichu. What I'd like to do right now is just do a follow-up on the previous video that we did where I showed you a couple of techniques, a couple of hand tricks that I know of, to learn your multiplication table. And one of them was basically holding out your hands like this and counting your digits from 1 to 10, right? So we would start off with the first pinky over here. We'd go 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, right? And if if you want to multiply any of these numbers with 9, all you end up doing is just going down the line and all you do is just fold back your number, right? And the result is whatever that the two numbers show is what you get when you multiply that number with 9. So for example, if you're multiplying 2 by 9, you go 1, 2, hold down the number, 2 times 9 is 1 and an 8, so it's 18, right? So let's just go through the whole thing and we can see that it works for all of them, right? So again, we can do if we do 1 times 9, you go just hold down the finger, go down to 1, hold down the finger, and 1 times 9 is just 9. If you do 2 times 9, you go 1, 1, 2 and pull this back and it's 18, right? 3 times 9 is 27, 4 times 9 is 36, 5 times 9 is 45, 6 times 9 is 54, 7 times 9 is 63, 8 times 9 is 72, 9 times 9 is 81, and 10 times 9 is 9 and you got a 0 at the end, so it's 90, right? Really easy hand trick, really easy to remember, and it's something that I've been using for a while, just for just to lighten things up, and if anybody has a hard time multiplying by 9, I show them this trick and they remember it off the get go. Now, I was just recently introduced to another hand trick that a student showed it to me, or the brother of a student, he was really keen on when I showed him this trick, he was really excited, and he went ahead and I asked him to do, this is a homework for me, is to show me another hand trick, because he wanted more information, I said, you know what, you learn it and you show it to me, and the next week when I saw him, he ran up to me all excited, said, listen, listen, I found another trick, and then I said, okay, show it to me, and the trick is basically this, you take your hands as we did with the first one, right? What you do though now is, you do your thumbs, you count these as 6, so your thumbs are 6, and then 7, 8, 9, 10, and this multiplication, this trick, works for numbers from 6, multiplying numbers from 6 to 10, so 6 to 10 multiplied by 6 to 10, this gives you all the answers, and it gives you more answers, and it is a little bit more complicated, but it's super powerful, because usually it's the higher numbers that people have a harder time remembering the multiplication table for, so what you do is, you start off with your thumbs as being 6, and you go 7, 8, 9, 10, right? So if you want to, for example, multiply 7 times 8, so you take one hand, and you go to 7, you go 6, 7, you take the other hand, you go to 8, you go 6, 7, 8, you touch the 7 and the 8 together, and then the way it works is, all the numbers from touching, from your two fingers touching, and back, including the two fingers that are touching, you count those as 10s, so this becomes 10, 20, 30, 40, 50, right? The numbers after the two fingers that you've touched, what you end up doing is, you multiply these two numbers together, and there's two left on this finger and three left on this one, so 2 times 3 is 6, so 7 times 8 is 50, 1, 2, 3, 4, 5, so that's 10, 20, 30, 40, 50, 2 times 3 is 6, 56, right? And this works for all the numbers from 6 to 10 multiplied together, so what we're going to do right now is just go through and confirm that that's the case, right? So let's start off with 6, right? We're going to use this one as our 6, and we're going to go down the road 6, 7, 8, 9, 10, so I'm going to multiply 6 by 6, and this one is, this one and the next one are unique because 6 times 6 is the two thumbs touching together, right? So this is a 10, and this is a 10, and then you have 4 times 4, and 4 times 4 is 16, so you have 10, 20 plus 16, which is 36, which is what 6 times 6 is. Let's say for the next number, we're going to multiply 6 times 7, so you take your 6, and you take your 7, and you touch them together, so 6 times 7 is 10, 20, 30, right? And then you have 3, 3 times 4, which is 12, right? So 30 plus 12 is 42, which is what 6 times 7 is, right? If you go to 6 times 8, I take my 8th finger, 8th position anyway, and 6th position, multiply them together, 8 times 6 is 10, 20, 30, 40, and then you got 2 times 4, which is 8, so that's 48, 6 times 9, and you got 10, 20, 30, 40, 50, right? And then 1 times 4 is 4, so 6 times 9 is 54, 6 times 10, that's an easy one, 10, 20, 30, 40, 50, 60, right? We have 4 numbers left here, but we've got no numbers left on this hand, so 4 times 0 is just 0, so 6 times 10 is 10, 20, 30, 40, 50, 60, right? Let's go up to the 7 digit, right? Let's see what these numbers multiply by 7 look like. We already did 7 times 6, right? Because 6 times 7 is the same thing, 7 times 6, so we're going to skip that, we're going to go to 7 times 7. 7 times 7 is 10, 20, 30, 40, and then we've got 3 times 3, which is 9, 7 times 7 is 49, 7 times 8 is 10, 20, 30, 40, 50, 2 times 3 is 6, so 7, 7 times 8 is 56, 7 times 9, we've got 10, 20, 30, 40, 50, 60, 1 times 3 is 3, so 7 times 9 is 63, 7 times 10, right? This is the 10th position, is 10, 20, 30, 40, 50, 60, 70, and then we've got 3 times 0, which is 0, so 7 times 10 is 70, right? Let's go to 8. Well, as before, we did 6 times 8 and 7 times 8, so we can skip those 2, 8 times 6 and 8 times 7. We're going to go to 8 times 8. 8 times 8 is 10, 20, 30, 40, 50, 60, and then we've got 2 times 2, which is 4, so 8 times 8 is 64, right? 8 times 9, we've got 10, 20, 30, 40, 50, 60, 70, and then 1 times 2 is 2, so 8 times 9 is 72, right? 8 times 10, 10, 20, 30, 40, 50, 60, 70, 80, and 0 at the back, right? So 10 times 8 times 10 is 80, right? That's 8 fingers, 8 10s, we got it. What we're going to do is go to 9. 9 times 6, we've already done. It's the same thing as 6 times 9. 9 times 7, 9 times 8, we've already done. Now what we're going to do is do 9 times 9. 9 times 9 is 10, 20, 30, 40, 50, 60, 70, 80, 80, and at the back, we've got 1 times 1, which is 1. So 9 times 9 is 81, 9 times 10 is going to be 90, and there's a 0 at the back, right? So 9 times 10 is 90, and then the last digit we have is the 10th position, right? So 10 times 10, because we've done 10 times all the other ones, right? We did 10 times 6, 10 times 7, 10 times 8, 10 times 9. So 10 times 10, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, right? So 10 times 10 is 100.