HOW DID I NOT KNOW THIS?!
Why do I learn more about math from Tumblr than my 12+ years of formal education????????
No math teacher ever taught me this trick. Got damn.
This is great and all if you know how to subtract things from 100
Ok, let me show you how this thing works.
Say you have two numbers A and B {in the example above 97 and 96} these two numbers can be represented by (100-x) and (100-y) {in the example above x = 3 because 100 – 3 = 97 => 100 – 97 = 3 and y = 4}. Now since A = (100-x) and B=(100 – y) therefore A*B = (100-x)*(100-y).
So if you want to multiply A*B it is the exact same as multiplying (100-x)*(100-y).
Good, so lets expand this sucker
(100-x)*(100-y)=100*100 – x*100 – y*100 -x*-y
So now lets combine things creativity
=(100 – x – y)*100 + x*y
=(100 – (x+y))*100 + x*y
So now you see it. 100-(x+y) shows up in the hundreds place {100-(3+4)=93 in this example} and x*y shows up in the ones place {3*4 = 12 in this example} thus giving the solution {9312}
Now what does that mean, well it means you can use this trick in a much wider application…
Like numbers close to different multiples of 10. For example 1000.
993 * 996
{1000 – 993 = 7}
{1000 – 996 = 4}
{1000 – (7+4) = 1000 – 11 = 989}
{7*4 = 028}
Therefore the first number now goes in the thousands place and the second in the ones place. Meaning
993*996 = 989028
We can also use it for numbers close to numbers that don’t start with 1 like 200.
192*195
{200 – 192 = 8}
{200 – 195 = 5}
{200 – (8+5) = 200 – 13 = 187}
Since 187 shows up in the 200’s place we need to multiply it by 2 to get the number that shows up in the 100’s place thus (187 *2 = 374)
{8*5 = 40}
Thus
192*195=37440
Have Fun!
WHAT?!
jugenmujugenmugokuumechousuke:
a
When a man dressed as Satan speaks more accurately about God than your pastor, you know something is wrong.
No. Seriously. Satan. Come Preach it.
oh look it’s back
This my older sister Chloe and her boyfriend Ryan. They have been dating for 2 years and won cutest couple award for senior year. This weekend was supposed to be the time of their lives. This weekend was prom. The morning of prom Ryan went to the Emergency Room because he was throwing up all night and couldn’t hold down water. It turned out that his kidneys were inflamed and he was dehydrated. He wouldn’t be leaving the hospital until Monday. The night that my sister dreamed of and planned for months was destroyed. She cried all morning and there wasn’t anything I could do to make her feel better. After a few hours she decided that she was going to dress up and visit him in the hospital. When we got to the hospital we ran in search of his room. Finally we arrived and Ryan’s face immediately lit up. Ryan couldn’t move much but he hugged her anyways. Chloe pinned his flower on his gown. They took pictures together posing and kissing and laughing. They held hands, talked, smiled and laughed. At one point they were just smiling at each other, like they were the only people in the room. They looked like the happiest people in the world. This was that moment. The moment when they just lovingly looked into each others eyes and smiled. The moment when all the bad things that were going on vanished. The moment when, this was the time of their life. This is what she dreamed of all her life. This is what he wanted to give her for so long. This was the moment when you saw, what true love really is.
Humorously done but it brings up a very good point about the song. (And I like how the guys immediately reacted, “Wow, dude, that’s not okay.”)
Seriously, even as like a ten year old I knew that line was just wrong.
I like how they beat the shit out of the rapist at the end. We need more humor on the side against rape like this video.
