Math Trick: Quickly Square a Number Ending in 5 in your head! - Free Educational videos for Students in K-12 | Lumos Learning

Math Trick: Quickly Square a Number Ending in 5 in your head! - Free Educational videos for Students in k-12


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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