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Here's the solutions for Section C of Revision 2

Revision 2 Section C Solutions

Butterfly of the Week - Commander

Last week, I introduced to you a butterfly with a warrior kind of name - Knight. This week, I will like to share with you a butterfly with some kind of respectable name - Commander. It is dark reddish-brown on the upperside and beautiful underside. My first encounter of it was near our World War 2 hero, Major-General Lim Bo Seng's Grave, after I had paid my respect to him before searching for butterflies. That's why until now, I still have very deep impression of this specie.  Hope you will like it.


 

Symmetry Alternative Assessment

Pls download the following file to work on for your Alternative Assessment.

https://docs.google.com/present/edit?id=0AWRBxqPvDRabZHJzNTZrbV85OWN6bXA5amY0&hl=zh_TW&authkey=CMiUqKEE

Email : commonbirdwing16@gmail.com

Revision Exercises, Worked Problems and Tips for Exams

I will start a series of Revision exercises here including self-marking excel files, worked solutions in powerpoint and some common errors to observe. Hope this will help you revise your work well.

Links to Revision 1 Exercises and Worked Problem Sums

Revision 1 Excel foe checking
https://spreadsheets.google.com/ccc?key=0AmRBxqPvDRabdDlNbXNUbmNZbUpQMVA2N2oydGt6V3c&hl=en&authkey=CKGX5LIB


Revision 1 Problem sums solutions
https://docs.google.com/present/edit?id=0AWRBxqPvDRabZHJzNTZrbV8weG5tNG5nYzg&hl=en&authkey=CJ_nx9UD


Revision 1 Solutions
https://docs.google.com/leaf?id=0B2RBxqPvDRabMjYxNDYwODEtYjU3Yi00OGVlLTk5N2ItZTQ4Nzg5ZDNiZTk1&hl=zh_TW&authkey=CML86fwI


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Butterfly of the Week - Knight

Whenever the word Knight is mentioned, you probably will think of a warrior riding on a horse. I have great respect for this butterfly, partly because of its name. Mainly, it has beautiful design on its wings which resembles that of a Hawk or an Eagle. The tips of its wings show the design that resembles the Eagle's Head. It's often found in the forest, sometimes at parks. Hope you like it, do write me your reflection.

Maths Olympiads 2010 Questions and Solutions

1. What is the value of the following?
(8 x 4)+(8 x 3)+(8 x 2)+(8 x 1)

Solutions :
Method 1
You just need to know your timestable well to get this questions correct.
32+24+16+8=80

Method 2
Understand that there is a Distributive Law which allows you to add first before multiplying, that is
(8 x 4)+(8 x 3)+(8 x 2)+(8 x 1) = 8 x (4+3+2+1) = 8 x 10 = 80

Find out more about the other laws from the weblink below
http://www.mathsisfun.com/associative-commutative-distributive.html

Q2. A bag contains 18 jelly beans, 4 are red, 6 are white and 8 are blue. Amanda takes them out one at a time without looking. What is the fewest jelly beans she must take out to be certain that at least 2 of the jelly beans she takes out are blue?

Method : Consider the worst case scenario
4 red + 6 white + 2 blue = 12 jelly beans

Q3. A prime number is a counting number with exactly two factors, the number itself and the number 1. In the sequence 2, 5, 11, 23, ... each number is obtained by doubling the previous number and adding 1.What is the first number in the sequence that is not a prime number?

Solution :
You should know about prime numbers before you can attempt this question. Using listing method and checking each number. Noticed that the first four numbers are all prime numbers.
2, 5, 11, 23,...
Continue to list...
47, 95...
95 is not a prime number because it is a multiple of 5.

Quick Answers for the rest of the questions:

4. 120 seconds
5. 66 cm
6. 182
7. 22
8. 26
9. 14 cm
10. 10 marbles
11. 9375
12. $13
13. 24 hours
14. 8 tiles
15. 71
16. $12
17. 12 paths
18. 6 hours
19. 58 cards
20. 27 cubes

Two Fractions Weblinks

Here are what you did in today's P4 Maths Enrichment. The fractions weblinks are as shown.

Clara’s Ice-cream Shop (Fraction)

http://www.mrnussbaum.com/icecream/index.html

Tony’s Fraction Pizza Shop

http://www.mrnussbaum.com/tonyfraction.htm