Math Trick: Quickly Square a Number Ending in 5 in your head! - By tecmath
Transcript
00:0-1 | Welcome to the Tech mouth channel . What this video | |
00:02 | is looking at today . It's gonna be looking a | |
00:03 | little trick how to square numbers that end in the | |
00:06 | number five . Pretty much instantaneously faster than any guy | |
00:09 | with a calculator . Be able to do it and | |
00:10 | you really , really smart if you can do this | |
00:12 | . So without much further ado , see if you | |
00:14 | can do this this far . So 35 square 35 | |
00:19 | times 35 equals what There you go . Should've had | |
00:22 | ransom by now . The answer is 12 45 . | |
00:26 | How did I do that so quickly ? There's a | |
00:28 | little trick for this and soon . Like really quickly | |
00:30 | you'll be able to do them to first off . | |
00:33 | Don't even think about this number five . We can | |
00:35 | forget about straight away . All our answers are going | |
00:38 | to finish in 25 . 1st off , the main | |
00:41 | thing you have to worry about is this number here | |
00:44 | . I think of the number three and then think | |
00:46 | of the number that comes after three , which is | |
00:47 | four . Multiply those guys together and you get the | |
00:51 | answer . 12 , 12 , 25 . Okay . | |
00:56 | That's simple . All right , Okay . So what | |
01:01 | about this time ? I'll go a bit of a | |
01:02 | harder number . We'll say say 95 squared . Ok | |
01:08 | . What's the answer ? 95 squared . So , | |
01:10 | I'm going to finish in 25 9 . Next number | |
01:13 | of his 10 . So nine times 10 is 90 | |
01:17 | And it's going to finish in 25 . There's our | |
01:19 | answer . That's pretty cool . Yeah . Let's get | |
01:23 | something even bigger . Let's go an even bigger number | |
01:26 | . Now let's go say something like uh 115 Squared | |
01:32 | . What does that equal ? All right , Again | |
01:35 | ? 11 , 11 times 12 . 11 times 12 | |
01:38 | is 132 25 . That's our answer . That's a | |
01:43 | really simple and easy trick practice . That one . | |
01:45 | You look really , really smart when you can just | |
01:47 | come out as fast as you can actually write it | |
01:49 | anyway . See you next time |
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Math Trick: Quickly Square a Number Ending in 5 in your head! is a free educational video by tecmath.
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