Mathematics: Post your doubts here!

[M.Omar]

All of these numbers are integers, so you'll be rounding the third integer-
64821.2675
Thus, you will round off the 8 in the above solution.
= 648oo.000
In other words, it is like rounding off to the nearest tens, if to two significant integers, to the nearest hundreds, if stated to round off to three significant figures and so on.

They may also ask you to round off to significant decimals.

wont it simply be 64800 not 64800.000 ?

 

[Phoenix Blood]

wont it simply be 64800 not 64800.000 ?

Same thing. I was just showing Ionic Blade how all the integers after 8, after being rounded off, turn into zeroes.

 

[Sariya Khan]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s03_qp_4.pdf
Can anyone please tell me the method to solve Q 6.?

 

[Phoenix Blood]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s03_qp_4.pdf
Can anyone please tell me the method to solve Q 6.?

6)a)i)
Volume= area of cross-section*length
= 2x*(x+1)*(x+4) cm^3

6)a)ii)
= (x+1)*(x+4)*2x
= x(x+4)+1(x+4)*2x
=(x^2+4x+x+4)*(2x)
=2x(x^2+5x+4)
= 2x^3+10x^2+ 8x cm^3

6)b)i)
subtract 2cm each from the base lengths, as 1cm is reduced from both sides. subtract 1cm from the vertical length of the box only.
2x = 2x – 2
(x+4)-2 = x + 2
(x+1) - 1= x

6)b)ii)
Volume= area of cross-section*length
=(2x – 2)*(x + 2)* x
=2x(x+2)-2(x+2)*x
=2x^2+4x-2x-4*x
=x(2x^2+2x-4)
=2x^3+2x^2-4x
Now, Interior volume - exterior volume'
= (2x^3+10x^2+ 8x)-(2x^3+2x^2-4x)
=8x^2+12x cm^3

6)c)i)
Volume of wood was 8x^2+12x cm^3
Now we know it equals 1980 cm^3
8x^2+12x = 1980
divide the equation by 4
2x^2 + 3x = 495
2x^2 + 3x - 495 = 0

6)c)ii)
solve 2x^2 + 3x - 495 = 0, quadratically, using....... -b=-√ b^2-4*a*c/2a
you'll get x=15 and x=-16.5
we'll assume x to be 15, because lengths can't be negative.
dimension 1= 2x= 2*15= 30cm
dimension 2= x+4 = 15+4 = 19cm
dimension 3 = x+1 = 15+1 = 16cm

 

[Sariya Khan]

Thanks a lot May you be rewarded for such a great help .Aameen

6)a)i)
Volume= area of cross-section*length
= 2x*(x+1)*(x+4) cm^3

6)a)ii)
= (x+1)*(x+4)*2x
= x(x+4)+1(x+4)*2x
=(x^2+4x+x+4)*(2x)
=2x(x^2+5x+4)
= 2x^3+10x^2+ 8x cm^3

6)b)i)
subtract 2cm each from the base lengths, as 1cm is reduced from both sides. subtract 1cm from the vertical length of the box only.
2x = 2x – 2
(x+4)-2 = x + 2
(x+1) - 1= x

6)b)ii)
Volume= area of cross-section*length
=(2x – 2)*(x + 2)* x
=2x(x+2)-2(x+2)*x
=2x^2+4x-2x-4*x
=x(2x^2+2x-4)
=2x^3+2x^2-4x
Now, Interior volume - exterior volume'
= (2x^3+10x^2+ 8x)-(2x^3+2x^2-4x)
=8x^2+12x cm^3

6)c)i)
Volume of wood was 8x^2+12x cm^3
Now we know it equals 1980 cm^3
8x^2+12x = 1980
divide the equation by 4
2x^2 + 3x = 495
2x^2 + 3x - 495 = 0

6)c)ii)
solve 2x^2 + 3x - 495 = 0, quadratically, using....... -b=-√ b^2-4*a*c/2a
you'll get x=15 and x=-16.5
we'll assume x to be 15, because lengths can't be negative.
dimension 1= 2x= 2*15= 30cm
dimension 2= x+4 = 15+4 = 19cm
dimension 3 = x+1 = 15+1 = 16cm

 

[sohaib ul haq]

ok so i have just 5 months left in exams plz some one guide me in my plan cuz i wana leave last 1 month for revision

 

[vevoxDho]

Re: IGCSE Maths Help--Available Here--Any Question

ok. There are so many forms of maths in IGCSE e.g international maths, additional mathematics, maths with coursework. What is the difference b/w dem and how many of dese cn a person give in one session?

By the way, maths with coursework(0581) have been stopped after 2014. So 2014 was the last year to take it.

 

[Snakebite_666]

Any good sites for maths revision ?

 

[Phoenix Blood]

Any good sites for maths revision ?

http://cathedral-lonavala.org/rcm.pdf

http://www.wiziq.com/tutorial/54524-EXAMINER-TIPS-for-IGCSE-Mathematics-0580

 

[Snakebite_666]

http://cathedral-lonavala.org/rcm.pdf

http://www.wiziq.com/tutorial/54524-EXAMINER-TIPS-for-IGCSE-Mathematics-0580

Thanks a ton!

 

[Harsh Poddar]

I've made a website to help students like me to access past papers faster. Check out signature below and share with friends.

P.S. I made it for myself earlier this year and got amazing reviews from friends and so I made it publicly available.

 

[Faiza Anwar]

can someone plzz post the link for 2014 May June paper.

 

[sj0007]

here u go:
http://www.gceguide.com/search/label/IGCSE : Mathematics (0580)

 

[idklol]

What's the difference between the two papers (Paper 2 and 4 I think, no coursework)?
With all my subjects I can see a difference in terms of content expressed in the questions.

For example: Sciences have a practical paper vs a multichoice vs a core/extended.

 

[sj0007]

If

What's the difference between the two papers (Paper 2 and 4 I think, no coursework)?
With all my subjects I can see a difference in terms of content expressed in the questions.

For example: Sciences have a practical paper vs a multichoice vs a core/extended.

If u see that paper 2 is easy and short whereas paper 4 is long and hard

 

[Phoenix Blood]

What's the difference between the two papers (Paper 2 and 4 I think, no coursework)?
With all my subjects I can see a difference in terms of content expressed in the questions.

For example: Sciences have a practical paper vs a multichoice vs a core/extended.

And paper 4 has multiple parts to each question. Paper 2 had independant questions uncomprised of sub-questions.
Basically in paper 4 you have transformation, matrices, probability, vectors, and one question on numbers. In paper two, you have simple quesstions on number, algebra, and geometry. But this isn't always the case...

 

[QatarOwnz]

Simplify: 10^-1/3 *25^2/3 divide 2^5/3

 

[$hadow]

Simplify: 10^-1/3 *25^2/3 divide 2^5/3

the answer is 5/4

 

[Shada Mohammed]

Work out the next two numbers if this sequence and the nth term
1, 4, 20, 120 ...... .......
nth term.......

explanation is needed

 

[idklol]

Work out the next two numbers if this sequence and the nth term
Give source please.
Answer is unknown to me! D: