Do you know all your times tables (multiplication tables)?
They say everyone should know all their times tables up to at least 12 times table by the time they leave school. Unfortunately I still don't know all of them, and I just can't seem to learn them quick. I know my twos, threes, fours, fives, nines, tens, and elevens. That's it. Oh, and I know my fifties and hundreds. That's it. I was always a bit behind with my maths anyway (always in bottom set for maths).
Anyone learnt all the times tables by the time you left school?
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Last edited by Joe90 on 16 Jun 2011, 12:15 pm, edited 1 time in total.
Anyone learnt all the times tables by the time you left school?
Do not worry. All that you really need are 0 x 0 ...... 9 x 9. All the rest can be done with additions and carries.
ruveyn
Anyone learnt all the times tables by the time you left school?
Do not worry. All that you really need are 0 x 0 ...... 9 x 9. All the rest can be done with additions and carries.
ruveyn
The distributive property works a ton as well.
e.g.,
What is 7 x 116?
This is the same as 7 x (100 + 10 + 6), or 700 + 70 + 42 = 812. Knowing how to FOIL in Algebra also is a major help.
So, 12 X 11 is
12 x (10 + 1) = 120 + 12 = 132
and so on.
You can easily break things down into 100s and 10s as much as you want to solve the problem given enough numbers.
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"You just like to go around rebuking people with your ravenous wolf face and snarling commentary." - Ragtime
Do you mean the statistical program R? I am really interested in it but have not gotten around to do much with it. Nothing thought about doing arithmetic with it though...I was thinking more bioinformatics and stuff like that. But that was a long time ago and I changed careers.
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"You just like to go around rebuking people with your ravenous wolf face and snarling commentary." - Ragtime
Do you mean the statistical program R? I am really interested in it but have not gotten around to do much with it. Nothing thought about doing arithmetic with it though...I was thinking more bioinformatics and stuff like that. But that was a long time ago and I changed careers.
Yup, I heard recommendations from various people that the language was good for bioinformatics/mathematical biology. R is pretty useful for basic arithmetic, and more arithmetically intensive stuff like matrix multiplication. There's a lot of documentation for the language, so it's well worth learning /advertisement
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I don't have the tables memorized at all. I calculate any simple arithmetic result whenever I need it... which is rather seldom.
Do you mean the statistical program R? I am really interested in it but have not gotten around to do much with it. Nothing thought about doing arithmetic with it though...I was thinking more bioinformatics and stuff like that. But that was a long time ago and I changed careers.
Yup, I heard recommendations from various people that the language was good for bioinformatics/mathematical biology. R is pretty useful for basic arithmetic, and more arithmetically intensive stuff like matrix multiplication. There's a lot of documentation for the language, so it's well worth learning /advertisement
R is a good stats program, but it's slow on a lot of tasks. For basic arithmetic you can use any program you like equally well (you could even use Python if you really wanted to) but for computationally intense tasks, especially involving matrices, you might be better off with a language that handles matrices more readily, like Matlab or one of the free clones like Scilab/Octave.
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Anyone learnt all the times tables by the time you left school?
Do not worry. All that you really need are 0 x 0 ...... 9 x 9. All the rest can be done with additions and carries.
ruveyn
The distributive property works a ton as well.
e.g.,
What is 7 x 116?
This is the same as 7 x (100 + 10 + 6), or 700 + 70 + 42 = 812. Knowing how to FOIL in Algebra also is a major help.
So, 12 X 11 is
12 x (10 + 1) = 120 + 12 = 132
and so on.
You can easily break things down into 100s and 10s as much as you want to solve the problem given enough numbers.
One still needs the carry rules to do the extended addition.
ruveyn
I've always found R to be good for matrix calculations between matrices smaller than 100,000 * 100,000, so long as you don't have them stuck in a loop. Unfortunately, efficiency problems seem to pop up where they really shouldn't. Still, it's easier than C...
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The scientist only imposes two things, namely truth and sincerity, imposes them upon himself and upon other scientists - Erwin Schrodinger
Member of the WP Strident Atheists
leejosepho
Veteran
Joined: 14 Sep 2009
Gender: Male
Posts: 9,011
Location: 200 miles south of Little Rock
Anyone learnt all the times tables by the time you left school?
Do not worry. All that you really need are 0 x 0 ...... 9 x 9. All the rest can be done with additions and carries.
The distributive property works a ton as well.
e.g.,
What is 7 x 116?
This is the same as 7 x (100 + 10 + 6), or 700 + 70 + 42 = 812. Knowing how to FOIL in Algebra also is a major help.
So, 12 X 11 is
12 x (10 + 1) = 120 + 12 = 132
and so on.
You can easily break things down into 100s and 10s as much as you want to solve the problem given enough numbers.
I do that a lot, but no longer as easily as during my younger days!
I had learned my "times tables" along with phonetics by the time I had finished the third grade (in 1959).
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e.g.,
What is 7 x 116?
This is the same as 7 x (100 + 10 + 6), or 700 + 70 + 42 = 812. Knowing how to FOIL in Algebra also is a major help.
So, 12 X 11 is
12 x (10 + 1) = 120 + 12 = 132
and so on.
You can easily break things down into 100s and 10s as much as you want to solve the problem given enough numbers
Still looks complicated to me. I literally go dyslexic when I look at numbers. It just looks like a pile of numbers to me.
_________________
Female
Anyone learnt all the times tables by the time you left school?
Do not worry. All that you really need are 0 x 0 ...... 9 x 9. All the rest can be done with additions and carries.
ruveyn
The distributive property works a ton as well.
e.g.,
What is 7 x 116?
This is the same as 7 x (100 + 10 + 6), or 700 + 70 + 42 = 812. Knowing how to FOIL in Algebra also is a major help.
So, 12 X 11 is
12 x (10 + 1) = 120 + 12 = 132
and so on.
You can easily break things down into 100s and 10s as much as you want to solve the problem given enough numbers.
This is pretty similar to how I do multiplication in my head, though I don't even really have 0x0 through 9x9 memorized i just kind of have a subset... when I want to multiply 7x9 in my head I have to break down the multiplication into a ones that I know 7x7 + 7x2 = 49 + 14 = 63. I should have probably just memorized all 0x0 to 9x9 but at this point i think my brain just does this sort of thing completely automatically and it would be hard to change now.
LostInEmulation
Veteran
Joined: 10 Feb 2008
Age: 41
Gender: Female
Posts: 2,047
Location: Ireland, dreaming of Germany
I remembered my times tables (0x0 to 9x9) in primary school, but in secondary when we were allowed to use the calculator, I kinda forgot them. Now I mostly use the program bc for it
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