before we start this video in 5 seconds can you quickly tell me how much is 86 * 84 it is 7224 I know many of you would have struggled to find it in 5 seconds but I am making a series of mental math videos and after completing this series and with a bit of practice you will be able to do calculations like these faster than a calculator that is at a lightning fast speed yes yes even faster than the snap of Thanos and you will be able to amaze your friends and appear smarter in front of them okay so are you ready we will first start with the very basic which is multiplying any two digit number with 11 how would you multiply 43 with 11 yeah I know we can use the method we had learned in school but it will be a bit longer but using this trick it will be super fast so write four and three and in the center write 4 + 3 or 7 that's it answer is 473 although it's basic but it's super fast now 54 * 11 write five and four and in between write 5 + 4 or 9 amazing but you might wonder what if the sum is greater than or equal to 10 like 68 * 11 write 6 then 8 and in the middle it will be 6 + 8 or 14 so take one to the carry and add with six to make it seven so the answer is 748 C lightning fast now you might be thinking that I am sharing tricks only for specific numbers but that's not Mental Math don't worry this is only the beginning as this is the first part there are many more such tricks to come now the trick I taught you also works with three-digit numbers for example 35 2 * 11 write three and two now in Center first add both of them to get eight and now add 5 + 2 or 7 here that's it we get 3872 and if the sum is greater than N9 then just carry like the previous one for example 5 74 * 11 so write five and four here then in the middle write 5 + 7 or 12 and here 7 + 4 or 11 now carry one here to make it six and then carry one here to make it three so the answer is 6314 awesome we are still faster than the calculator now let us move to the next trick which is multiplying two two-digit numbers with the same first digit and ending in five like multiply 75 * 75 in 5 seconds you might be blank right now am I correct so the trick here is to multiply seven with the next number or eight to get 56 and then simply add 25 to it this will be 5 6 25 okay now try 35 * 35 3 * 4 is 12 and then add 25 that's it faster than a calculator isn't it now tell me in the comments what will be 95 * 95 great now are you ready for the next trick it is multiplying two two-digit numbers with the same first digit of both the numbers and the sum of the ending digits is 10 for example 44 * 46 here the first digit of both the numbers are the same which is four and the sum of the ending digits is four 4 + 6 or 10 now do four * its next number or five which is 20 and then 4 * 6 or 24 so the answer is 2024 isn't this cool now let us try 67 * 63 6 * 7 is 42 and 7 * 3 is 21 so we get 4 22 1 awesome we're still beating calculators in spe speed okay now tell me in the comments what will be the value of 89 * 81 you are already doing calculations faster like a human calculator lastly don't forget to practice this trick and you'll get even faster if I get 10,000 likes in this video I will make part two of it which will be much more interesting and super fun so good [Music]