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Arithmatic



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Thu Jan 29, 2009 2:46 am
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Stori says...



I need some help here, people. I just can't keep my facts straight; multiplication is a particular hard spot.

Can you please teach me a way to remember the times tables?
  





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Thu Jan 29, 2009 2:52 am
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Antigone Cadmus says...



Honestly? Memorize them. :D

But I know that isn't helpful, so here is a way to remember the 9 times tables.

Line up all the numbers from 0-9:

0
1
2
3
4
5
6
7
8
9

Now, next to that column, write numbers descending: 9-0

0 9
1 8
2 7
3 6
4 5
5 4
6 3
7 2
8 1
9 0

---------------------------------------------------------

See?

0 9 -- 9 X 1 = 9
1 8 -- 9 X 2 = 18
2 7 -- 9 X 3 = 27
3 6 -- 9 X 4 = 36
4 5 -- 9 X 5 = 45
5 4 -- 9 X 6 = 54
6 3 -- 9 X 7 = 63
7 2 -- 9 X 8 = 72
8 1 -- 9 X 9 = 81
9 0 -- 9X 10 = 90


Sorry, that's all the tricks I know.

In the end, your best option is to simply memorize.

Hope this helped,
Sakura
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nescio, sed fieri sentio et excrucior.
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Thu Jan 29, 2009 10:42 am
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WaterVyper says...



The two times tables are just every even number. Though, that is quite obvious. Hm, the ten times tables are just a number followed by a zero. The eleven times table, I know a bit on it.

If multiplying by a single digit number, write that digit twice. For example, 3 x 11= 33.

Now, if multiplying two digit numbers, there's a secret trick. For example, let's take 15 x 11. First of all, you take the two digits and write them out, leaving a space between them. It would look something like this:

1 5

Next, add the two digits up and put them in the middle. Now, we have

165.

And that's all there is to it! But, if you're doing something like 86 x 11, we would put this:

8 6

But, 8+6 is 14. So, you have to add 1 to the hundreds digit, and put the '4' between. Like carrying over. So, we have this:

946

Well, sorry if it wasn't that clear. I'm not good at explaining stuff.
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Fri Jan 30, 2009 1:46 am
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fluteluvr77 says...



I'd memorize it but another trick for the 9 times tables

Hold your hands in front of you with your fingers spread out.
For 9 X 3 bend your third finger down. (9 X 4 would be the fourth finger etc.)
You have 2 fingers in front of the bent finger and 7 after the bent finger
Thus the answer must be 27
This technique works for the 9 times tables up to 10.

For the 2 times tables, double the number

For the 4 times tables, double it again

For the 5 times tables, add a zero to the end of the number then divide by 2

For the 10 times tables, just add a zero to the end of the number

Hope this helped :)
  





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Fri Jan 30, 2009 2:06 am
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Rosendorn says...



Oh, I had a nightmare of a time learning my times tables.

The only real advice I can give is as somebody to put together worksheets of the multiplication tables in random order. And not just one or two. I'm talking about a hundred pages. After doing those for about two months I memorized them.

You can start off with things in the same order (1s in order, then 2s, 3s, ect) but once you've gone through all of them then start mixing them up a little. Then a little more, then a little more, until they are completely random.

That's the only real tip I can give you.

(If you're wondering, the program I used was Kumon Math)
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Fri Jan 30, 2009 2:16 am
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niteowl says...



Watch School House Multiplication Rock. Seriously. I still think of some of those songs when trying to remember my times tables. Practically every time I count by threes, I sing "3,6,9,12,15,18..." and think of the football players running out. Okay, maybe I'm weird, but it's still awesome.

As for memorizing basic times tables, I was forced to in third grade through timed tests. Haven't forgotten them since. Maybe there's a way you can do this on your own (like what Rosey was talking about)?
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Fri Jan 30, 2009 5:03 pm
LilyJamey says...



Oh, just say to yourself: one two two, two two four, three two five, four two eight, five two ten.. so forth. That was how I did it, only in Chinese. I memorised it when I was six and it's been stuck in my mind ever since. The moment I say eight five, forty comes to mind. Get someone to drill you, too, like my mom did. Make them shoot you numbers like three six (eighteen) at random.
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Sat Jan 31, 2009 12:14 am
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Snoink says...



If multiplication is really bad for you, you can add instead. After all, 10x9 just means add the number 10 nine times. So 10+10+10+10+10+10+10+10+10. As you can probably guess, it gets a little burdensome at times, but perhaps that will help you get the numbers in your head faster?
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Sat Jan 31, 2009 12:50 am
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guitargrl1323 says...



jump on your bed while singing a song about them...no joke, it will help you.
good luck-
bren
  





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Sat Jan 31, 2009 6:52 am
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madel says...



wow math is the subject which i hate most

actually i cursed this subject..

all i want to do is to have a time machine and

assassinate all those people who made this

headache to me...specially that algebra!!!

now....who's with me??
:)
:)
think of a way to get what you want

without giving up more than what you have....
  








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