IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: Deadly_king on October 01, 2010, 05:52:05 am
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What smallest number is to be multiplied to 722 to obtain a square number?
The answer is obviously 2. However this question was to be attempted under exam conditions without the use of a calculator.
I feel rather uncomfortable asking for such a silly question but I think its worth it.
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Was this in a CIE or Edexcel paper ?
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Let the number be x.
? 722x must equal to a number to the square.
Find the multiples of 722.
722/2 = 361
Look for a number to divide 361 with. Isn't an even number, nor is it 3, then it has to be a prime number.
361/19 = 19
So, the multiples of 722 = 19^2 * 2
For 722 to be a squared number, 2 has to be to the power of 2 too.
>>> ? 722x =? 19^2 * 2^2
>>> x = 2.
;D
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Let the number be x.
? 722x must equal to a number to the square.
Find the multiples of 722.
722/2 = 361
Look for a number to divide 361 with. Isn't an even number, nor is it 3, then it has to be a prime number.
361/19 = 19
So, the multiples of 722 = 19^2 * 2
For 722 to be a squared number, 2 has to be to the power of 2 too.
>>> ? 722x =? 19^2 * 2^2
>>> x = 2.
;D
Thanks dude........that was really helpful :)
+rep.....after i spread the love
Neither one Ari.........it was just a test at school level :P
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Okay okay. That wasn't me ::)
I wouldn't be able to answer such a question.
It was your lovely Mauritius friend Alpha who Facebook messaged me the answer to reply to you. +Rep her, not me (:
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If Alpha read that post, why has she banned herself? :P
She doesnt trust her self yet
Anyway
you need to get the multiples of the number
then see what multiply need a second one to give you two sets of identical multiples
722=2*19*19
so you need the second 2 to get two sets of multiples
(2*19)(2*19)
p.s. if you could see 19 was the square root of 361 without a calculator, your brain works better than mine
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Okay okay. That wasn't me ::)
I wouldn't be able to answer such a question.
It was your lovely Mauritius friend Alpha who Facebook messaged me the answer to reply to you. +Rep her, not me (:
Ooh.........alright then.
Yeah......I know she's pretty busy with her exams and all that. Thank You Alpha :)
I know you're going to see this post :P
But Requiem has a point there.............it's not something we know by heart.......I mean 19*19=361.
Manually it takes a whole lot of time ;)
Nope Requiem........Alpha has full confidence in herself. Am pretty sure about that but sometimes you need not take too much risks :P
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And about finding the square root of 361:
We know 15*15= 225 and 20*20= 400. We'll use them as landmarks.
Therefore, 15 < ./ 361 < 20
Possibilities: 16, 17, 18, 19.
An even number is one which can be divided by 2 => any number multiplied by an even number will necessarily give an even number.
From the above, we can eliminate 16 and 18 since 361 is odd.
7*7 will give 49, 361 ends with 1, so 17 cannot be the required number. 9*9 gives 81, it corresponds to 361.
Conclusion reached by logical procedures, which means you need not know the multiplications by heart. But you sure need a good brain. ;)
N.B ./ is used for the root sign.
;D
AND ROXY STRIKES AGAIN :P
Hope I answered your question with my amazing math skills :)
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And about finding the square root of 361:
We know 15*15= 225 and 20*20= 400. We'll use them as landmarks.
Therefore, 15 < ./ 361 < 20
Possibilities: 16, 17, 18, 19.
An even number is one which can be divided by 2 => any number multiplied by an even number will necessarily give an even number.
From the above, we can eliminate 16 and 18 since 361 is odd.
7*7 will give 49, 361 ends with 1, so 17 cannot be the required number. 9*9 gives 81, it corresponds to 361.
Conclusion reached by logical procedures, which means you need not know the multiplications by heart. But you sure need a good brain. ;)
N.B ./ is used for the root sign.
;D
AND ROXY STRIKES AGAIN :P
Hope I answered your question with my amazing math skills :)
hehe.....this explanation is much clearer :)
Indeed you have undoubted skills........but who must I +rep for this one??? :P
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Just +rep Jump man.
For Her awesomeness ;)
-Requiem
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Just +rep Jump man.
For Her awesomeness ;)
-Requiem
hmm......i just wanted to know if this one was from Alpha too?
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Huhh ? Alphaaa ? Does she exist ?
:P
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Huhh ? Alphaaa ? Does she exist ?
:P
Alright....i'll + rep you then ;)
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Alright....i'll + rep you then ;)
noooooooooooo. + rep alpha when she comes back (:
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noooooooooooo. + rep alpha when she comes back (:
Hey I understood it was Alpha's work ;)
I had already + repd for the first answer.
Now I +rep you for being a good intermediate :P
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LOL thanks (:
And I'll +rep you for +repping me.
aannnddd we have to both remember to +rep alpha when she comes back :D
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LOL thanks (:
And I'll +rep you for +repping me.
aannnddd we have to both remember to +rep alpha when she comes back :D
hehe thanx br0 :)
Of course.......we cannot forget her. Am sure she'll be back by the end of this month ;)
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hehe thanx br0 :)
Of course.......we cannot forget her. Am sure she'll be back by the end of this month ;)
Yeah Sis. :P
InshAllah. :D
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Yeah Sis. :P
InshAllah. :D
Ameen... :)
I don't have enough time to argue with you :P
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Ameen... :)
I don't have enough time to argue with you :P
LOL.
Okayy okayy. I'm a girl ::)
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LOL.
Okayy okayy. I'm a girl ::)
Hehe........Either you are pretty much confused about your gender or you are trying to fool me :P
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Hehe........Either you are pretty much confused about your gender or you are trying to fool me :P
1- I'm confused about my ender.
2- I'm a girl ;D
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Even i could figure out jump is a he.
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Even i could figure out jump is a he.
Yeah.....i can do so as well.
I wonder why he's insisting he's a girl though ???
I guess he must be tired.....or something like that :P
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Must be bored
But dont be surprised when you actually get to see him
He :P is quite interesting
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Must be bored
But dont be surprised when you actually get to see him
He :P is quite interesting
Hahahah..........sure he'll be ;)
But that won't be tomorrow :P
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Sorry what did you say
::)
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1- I'm confused about my gender
2- I'm a boy
;D
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1- I'm confused about my gender
2- I'm a boy
;D
ur a tomboy not a boy ;)
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ur a tomboy not a boy ;)
a WHAT ? :o
MY NAME IS NOT TOM!!!! :P
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a WHAT ? :o
MY NAME IS NOT TOM!!!! :P
Hmm Okay then I'l call ya Tony :P idk LOL ;D
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Hmm Okay then I'l call ya Tony :P idk LOL ;D
>: (
1- I'm confused about my gender
2- I'm a girl ;D
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>: (
1- I'm confused about my gender
2- I'm a girl ;D
OMG......this tomboy called Tony is bluffing ;)
OK....then.
You are a boy who wishes to be a girl but at the same time likes to be a boy :P
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OMG......this tomboy called Tony is bluffing ;)
OK....then.
You are a boy who wishes to be a girl but at the same time likes to be a boy :P
LOOL.
Okay. I'm a girl. I swear :P
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LOOL.
Okay. I'm a girl. I swear :P
Stop lying man. We all know you're a boy ::) :P
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LOOL.
Okay. I'm a girl. I swear :P
It's not good to swear when lying dude :P
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LOOOOOOOOOOOOOL.
FINNNEEE I ADMIT.
I AM A WANNABEE GIRL.
:(
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LOOOOOOOOOOOOOL.
FINNNEEE I ADMIT.
I AM A WANNABEE GIRL.
:(
piiewww........you took your time but in the end I guess you can no more hide the truth ;)
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piiewww........you took your time but in the end I guess you can no more hide the truth ;)
Yes.
But I wish I was a girl :'(
Being a boy makes my life SO difficult!
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Holy Epic Crap
I hope you are not gay :o
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Yes.
But I wish I was a girl :'(
Being a boy makes my life SO difficult!
Nan.........you should never think like this. There's a reason why Allah chose you to become a guy and not a girl. This reason, it's upto you to discover and makes the most of it!
Life is never difficult.......it is the choices and actions that you make that makes it appear difficult.
You need to gain full control over your life........think well before taking any decision and am sure that then Allah will guide you towards success in life :)
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Nan.........you should never think like this. There's a reason why Allah chose you to become a guy and not a girl. This reason, it's upto you to discover and makes the most of it!
Life is never difficult.......it is the choices and actions that you make that makes it appear difficult.
You need to gain full control over your life........think well before taking any decision and am sure that then Allah will guide you towards success in life :)
Thanks for the advice Deadly_king, but honestly, I'm a girl. I was just messing :)
and no, I don't find my life so difficult. looool.
@Requiem- I am :-X :P
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Thanks for the advice Deadly_king, but honestly, I'm a girl. I was just messing :)
and no, I don't find my life so difficult. looool.
@Requiem- I am :-X :P
Ok.....let us admit you are a girl. How do you plan to convince all of us?
Hey Requiem.....he or she is a gay girl :P
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Oh my, what has this conversation devolved into ? ::)
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Ok.....let us admit you are a girl. How do you plan to convince all of us?
Hey Requiem.....he or she is a gay girl :P
LOL- i don't need to convince ALL of you. Just you. Everyone knows I'm a girl :P
I've been here for over a year. I'm sure they would have figured out my gender by now :P
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Hey Requiem.....he or she is a gay girl :P
yes, he's a gay girl :P
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Oh my, what has this conversation devolved into ? ::)
[/quote
It's all YOUR fault :P
You're the one who was like 'Stop lying we all know you're a boy' :P
Hahahaha. Otherwise, Deadly_King would've believed me by now ::)
:P
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wtv :P
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LOL.
I thought you'd have nothing to say :P
There is someone who isn't on the forum viewing this topic as a guest. I feel like poking them :P
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Ok........i surrender.
Jump is a girl.......i agree on that.
Let me plz now rest in peace :P
I think I know this someone.....,.am damn sure i'll get a morale from her when she comes back ;)
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looooool im no a girl yo o.o
anyways. YOU KNOW ME!?! :o
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And AND i got to know
he will marry a man.
in 2 years time
Reincarnation of Ricky martin and Elton John
God bless :D
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looooool im no a girl yo o.o
anyways. YOU KNOW ME!?! :o
Whatever you are...........we'll see about that later. ;)
I need to concentrate on my studies for now.
By the way......I was referring to the one who is viewing the topic as guest :P
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LOL. Okay, sorry if my gender change is distracting you from your work :P
Good luck yo (:
hahahah. I think I know them too :P
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LOL. Okay, sorry if my gender change is distracting you from your work :P
Good luck yo (:
hahahah. I think I know them too :P
We'll talk about your gender change later :P
Thanks...........I better catch up now ;)
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Hey guys, can anyone please help me with June 2010 p4 No 7(ii) and (iii) ???
I am having some problems with it :-\
Thanks :)
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here :)
If u have any confusion feel free to ask :D
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here :)
If u have any confusion feel free to ask :D
Damn it!
I forgot to specify that it was p43
I had no problem with p42. Sorry for the confusion dude :(
So it's June 2010 p43 No 7(iii)
I figured out the second part......... ;)
Anyway thanks for your help buddy :)
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You found out the maximum acceleration for the blocks to move together as 2m/s^2
And you know the limiting friction is 3150 N
P-3150= 450a
P=4050N
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You found out the maximum acceleration for the blocks to move together as 2m/s^2
And you know the limiting friction is 3150 N
P-3150= 450a
P=4050N
Ooh........ I did not interpret it like this........I guess that's why I was having problems.
It's much simpler from your point of view :)
Anyway thanks loads for your help..........I badly needed to know how to do this since am pretty sure there will be a similar number in Nov 2010 p4 this Monday.
+rep to the fat cat ;)
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You're welcome :)
Yeah do them well...I'm looking for similar practice questions...cause I'm done with the papers. If you know where I can get them, just lemme know :)
Thanks for the rep :D
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Have you tried OCR ?
OCR is the sister company of CIE.
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You're welcome :)
Yeah do them well...I'm looking for similar practice questions...cause I'm done with the papers. If you know where I can get them, just lemme know :)
Thanks for the rep :D
Yeah me too. Though i've not yet found other papers for practice.
My teacher advised me to try OCR just like Ari suggested, but you should limit yourself to the CIE syllabus ;)
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Oh ok OCR then...thanks :)
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Oh ok OCR then...thanks :)
If you notice, all the questions in your P1 and P2,P3 textbooks are OCR questions and NOT CIE past paper questions :)
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Sorrryy I couldn't help, I didn't have my Maths Cap on :P
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Sorrryy I couldn't help, I didn't have my Maths Cap on :P
Then what cap are you wearing today ??? ;)
In other words you cannot work without a cap ??? :P :P
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Then what cap are you wearing today ??? ;)
In other words you cannot work without a cap ??? :P :P
Cap = Alpha :P
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Cap = Alpha :P
Hahaha........you seem very close to Alpha for her to lend you her cap :P
Anyway..........you must try doing some Maths without your cap ;)
Moreover I doubt Alpha will be able to do this number.......it's mechanics. She does only statistics :P
Nevertheless I should not underestimate her capabilities :D
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Hahaha........you seem very close to Alpha for her to lend you her cap :P
Anyway..........you must try doing some Maths without your cap ;)
Moreover I doubt Alpha will be able to do this number.......it's mechanics. She does only statistics :P
Nevertheless I should not underestimate her capabilities :D
yes, very close :)
LOL- Forget it mate Me =/= Maths :P
She can do lots of things ;)
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LOL- Forget it mate Me =/= Maths :P
She can do lots of things ;)
What's your speciality then ??? apart from joking :P
Yeah.........I have no doubt about that ;)
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~none~
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~none~
^ believe him :P
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Nobody insults my brother now
I will rip,eat and digest >:(
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Nobody insults my brother now
I will rip,eat and digest >:(
tasty :P
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tasty :P
Hahaha.........I don't think i would like to taste that though :P