Sunday, March 14, 2010

Algebra Puzzle


3=a+a+a
7=a+b+c
8=c+b+c

*********
a=star
b=clock
c=flower
*********

3÷3=1 (a)
4-1-1=2 (c)
(9-1)÷2=4 (b)

Tuesday, March 9, 2010

S&W assessment video

My First Try:


video
My Second Try:


video

Sunday, February 7, 2010

Total Defence ~ Personal Reflection

1) What is my role in Total Defence?
-->To be PROUD of Singapore :D
-->To live in harmony with other people
-->Work together!

2) What resources does Singapore need in the 21st Century and how can I contribute, now and in the future?
-->Singapore needs more talent
--> I can contribute by getting more knowledge (studying! :D )

Friday, January 22, 2010

Prime Factorisation (continues...)

25.the prime factorisation of a number is 2⁴x3⁵x7²x11. write down 3 factors of the number that are greater than 100.



ans: 2x2x2x2=16 3x3x3x3x3=243 7x7=49 11x1=11

16x243x49x11=2,095,632


->16x243=3888

->243x49=11907

->49x11=539


26.the prime factorisation of two numbers are 2 x 3² x 7³ x 13 and 3 x 7² x 13³x17. write down 3 common factors of the numbers.


ans: 2x2=2 3x3=9 7x7x7=343 13x1=13 ----> 2x9x343x13=80,262

3x1=3 7x7=49 13x13x13=2197 17x1=17 ----> 3x49x2197x17=5,490,303


->3

->13

->21




*the highlighted numbers are the answers*

Wednesday, January 20, 2010

Maths Textbook Question

A mathematician proposed that "Every even number greater than 2 can be expressed as a sum of two prime numbers." Do you agree? Why?

I agree. Because...

4 = 2+2
6 = 3+3
8 = 3+5
10 = 5+5
12 = 5+7
14 = 7+7
16 = 3+13
18 = 5+13
20 = 7+13
22 = 5+17
24 = 7+17
26 = 7+19
28 = 5+23
30 = 7+23
32 = 3+29
34 = 17+17
36 = 31+5
38 = 31+7
40 = 37+3
42 = 37+5
44 = 41+3
46 = 41+5 since it still works until 46...

it might just work for the others :D

Wednesday, January 13, 2010

Numbers as a Language

Under East Asian numerals, there's a system called counting rods. It represents digit by number of rods. To avoid confusion, vertical and horizontal forms are alternatingly used. Generally, vertical rod numbers are used for the position for the units, hundreds, ten thousands, etc., while horizontal rod numbers are used for the tens, thousands, hundred thousands etc.

eg.
Positive Number
0 1 2 3 4 5 6 7 8 9
Vertical: File-Counting_rod_v1r.png File-Counting_rod_v2r.png File-Counting_rod_v3r.png File-Counting_rod_v4r.png File-Counting_rod_v5r.png File-Counting_rod_v6r.png File-Counting_rod_v7r.png File-Counting_rod_v8r.png File-Counting_rod_v9r.png

Horizontal: Counting rod h1r.png File-Counting_rod_h2r.png File-Counting_rod_h3r.png File-Counting_rod_h4r.png File-Counting_rod_h5r.png Counting rod h6r.png Counting rod h7r.png File-Counting_rod_h8r.png File-Counting_rod_h9r.png

Negative Number
0 1 2 3 4 5 6 7 8 9
Vertical: Counting rod v1.png Counting rod v2.png Counting rod v3.png Counting rod v4.png Counting rod v5.png Counting rod v6.png Counting rod v7.png Counting rod v8.png Counting rod v9.png
Horizontal : Counting rod h1.png Counting rod h2.png Counting rod h3.png Counting rod h4.png Counting rod h5.png Counting rod h6.png Counting rod h7.png Counting rod h8.png Counting rod h9.png
0 cannot be written in counting rods system so I might just say its IMPOSSIBLE.

credits.... http://en.wikipedia.org/wiki/Counting_rods

Saturday, January 9, 2010

CaMp ReFlEcTiOnS

The three mail points are ...
---> Teamwork
---->Cooperation
----->Plan before we do anything

They can help the class to be more united.

If I have another chance, I would try out the Mud Slide (at the 'Milo Pool') because it was very fun... Especially because it was very slow at first, then it was very fast, moreover, I was cold when I went out of the pool.

I think I would participate more in the cheer.
~LeTs ShOuT~

 
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