Q&A - P3 Math

[ttyh]

Sorry…!


1st pattern - 1 dot
2nd pattern - top layer 1 dot, bottom layer 3 dots
3rd pattern - top layer 1 dot, middle layer 3 dots, last layer 5 dots
4th pattern - top layer 1 dot, 2nd layer 3 dots, 3rd later 5 dots, last layer 7 dots
Question : How many dots would there be at the bottom layer if there were 999 layers?

[MathIzzzFun]

ttyh:

Sorry...!


1st pattern - 1 dot
2nd pattern - top layer 1 dot, bottom layer 3 dots
3rd pattern - top layer 1 dot, middle layer 3 dots, last layer 5 dots
4th pattern - top layer 1 dot, 2nd layer 3 dots, 3rd later 5 dots, last layer 7 dots
Question : How many dots would there be at the bottom layer if there were 999 layers?

Hi

bottom layer = the nth odd number = 2n-1
eg. 3 layers -> 3rd pattern -> 2 x 3 -1 = 5 dots at bottom layer
so, 999 layers -> 999th pattern -> 2 x999 -1 = 1997 dots at bottom layer

cheers.

[chloecube]

Champion:

Hi! Sorry to trouble you all again?


May I Know How do I draw model for the following Question 5? DD1 said Teacher told them use model to get the answer!
http://i55.tinypic.com/wpljo.jpg\">

is the answer 10 and 1/2?

[MathIzzzFun]

chloecube:

Champion:

Hi! Sorry to trouble you all again?


May I Know How do I draw model for the following Question 5? DD1 said Teacher told them use model to get the answer!
http://i55.tinypic.com/wpljo.jpg\">

is the answer 10 and 1/2?

Hi

hope this model will help....

http://i56.tinypic.com/15p0raq.jpg\">

cheers.

[ttyh]

Angel25:

Hi, can someone pls help me solve the two qns. Thanks.


http://i52.tinypic.com/2qurh1w.jpg\">

Hi, I'm interested to know how this 2 questions are solved.
Any Guru? Help!

[Jenlimtz]

Hi


Need help on the below question:

Mary has 3/8 litre of orange juice. Jane has 1/4 litre more orange juice than Mary. Susan has 1/2 litre less orange juice than Jane. How much orange jucie does Susan have? Leave your answer in litre.

TIA.

[corneyAmber]

WCW genius :imcool: ....can do without diagrams ...


Here's an alternative approach:
http://i53.tinypic.com/4v0mra.jpg\">

[Jenlimtz]

Thank you so much, WCW & ksi!


Another question:

A group of people took part in a survey. 1/4 of them were men. 5/12 of them were women and the remaining 68 people were children.

a. How many people took part in a survey?
b. Express the number of children as a fraction of the number of women.

[corneyAmber]

Pizza for you Champion!


http://i52.tinypic.com/2ue6xkk.jpg\">

[corneyAmber]

http://i54.tinypic.com/2wfuuiw.jpg\">