mafiaknight
mafiaknight t1_iuaqwco wrote
Reply to [OT] I've been trying to make a post but the automoderator keeps removing it. I don't know what's wrong with it. Please help. by Idontluvmenoonedoes
It’s seeing the word “queen” and autodeleting it. Message a mod to fix it
mafiaknight t1_itiqhzt wrote
Reply to comment by Plinklypl0nk in Eli5 the equation 51 times 52 by Plinklypl0nk
(This is MUCH harder to explain over text...way easier to show you...I’ll do my best)
This is a way to break down large number multiplication into single digit multiplication.
The first term we have is 51. So I decided to put that on top.
The second term we have is 52. So I put that under it.
That looks like this:
51
52
—
Now I can multiply the individual numbers together, but I have to make sure I write them down in the right order.
So, first we multiply the top term by the first digit of the bottom term (a 5)^((from 52 into both the 5 and 1 from 51)).
Ok, what’s 5x5?
25
What’s 5x1?
5
So the first two get written on the same line right?
That gives us 25 in the 10s spot and 5 in the 1s spot. (The 2 carrying over to the 100s spot automatically). (So we have 250 + 5 to break it ALL the way down) or more simply: 255.
Now what’s 2x5?
10
And 2x1?
2
When we move to the next digit in the second term we also need to move to a new line. But remember that the next digit (the 2) is one place to the right of the previous digit. So we need to move our answers one digit to the right as well.
Now we take the 10 in the 10s place (letting it’s 1 fall in the hundreds place.) and we set the 2 in the 1s place. (To break it down again we get 100 + 2) or more simply 102.
Now we have 255 and 102 right? And 255 goes down on the first line, with 102 on the second, but one place to the right.
That looks like this:
255
_ 102
Right?
So the 2 drops down and adds with the nothing for a 2.
2- - -
Then the 5 drops down and adds with the 1 for 6.
2 6 - -
Then the next 5 drops and adds with the 0 for 5.
2 6 5 -
We’ve run out of numbers on the first line, but have one more on the next. We’ll drop a 0 (to fill that place) and add it to the 2 we have left for 2.
2 6 5 2
And that’s our answer.
So, to write it out again:
51
x52
——
2 5 5
+ 1 0 2
————
2 6 5 2
This works for any size number multiplied with any other number of any size.
mafiaknight t1_itin3ug wrote
Reply to Eli5 the equation 51 times 52 by Plinklypl0nk
Do you want a breakdown or the math worked out here?
Set one over the other for ease of keeping track. Then multiply the first number of the second term by the two numbers of the first term. Then do the same with the second number of the second term. Write the second set under the first and offset by one place. Now add them together.
51
52
—
255
0102
—
2652
Checking with my calculator: 51x52=2652
mafiaknight t1_is36hvp wrote
Reply to Tifu by realising I was never bullied by [deleted]
This isn’t a fuck up nor is it really a single moment in time. You’ll be fine. Even if someone DOES jump you over this, it’ll be someone you know just messing with you.
Still useful to keep up your skill. It’ll come in handy one day, even if it’s just to impress someone
mafiaknight t1_iubg95x wrote
Reply to park graffiti by whatisanerd
Should have used better punctuation! ^((It saves lives))