1. Mathematics Ronald Hui Tak Sun Secondary School

2. Ronald HUI Mathematics What have you visited here? What have you visited here? http://personal.tsss.edu.hk/roh http://personal.tsss.edu.hk/roh http://personal.tsss.edu.hk/roh Have you started your homework? Have you started your homework? Standard Homework (II) Standard Homework (II) Deadline: 14 Sep (Wed) Deadline: 14 Sep (Wed) Are you ready for Dictation? Are you ready for Dictation?

3. Ronald HUI Revision Arithmetic Operations Arithmetic Operations “+” – Addition “+” – Addition Add… to…, Plus, Sum Add… to…, Plus, Sum “–” – Subtraction “–” – Subtraction Subtract… from…, Minus, Difference Subtract… from…, Minus, Difference “x” – Multiplication “x” – Multiplication Multiply… by…, Times, Product Multiply… by…, Times, Product “  ” – Division “  ” – Division … is divided by…, Over, Quotient … is divided by…, Over, Quotient

4. Ronald HUI Revision Numbers Numbers Natural Number ( 自然數 ) Natural Number ( 自然數 ) Whole Number ( 完整數 ) Whole Number ( 完整數 ) Even Number ( 偶數，雙數 ) Even Number ( 偶數，雙數 ) Odd Number ( 奇數，單數 ) Odd Number ( 奇數，單數 ) Division Division Dividend ( 被除數 ), Divisor( 除數 ), Dividend ( 被除數 ), Divisor( 除數 ), Quotient ( 商 ), Remainder ( 餘數 ) Quotient ( 商 ), Remainder ( 餘數 )

5. Ronald HUI Dictation 1 Words will be read twice Words will be read twice 8 words 8 words 4 expressions 4 expressions Write them out in words Write them out in words Example: Example: Question:4 – 3 Question:4 – 3 Answer:Four minus Three Answer:Four minus Three Subtract three from four

6. Ronald HUI Dictation 1 Listen the words carefully Listen the words carefully 1. 1. 2. 2. 3. 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8.

7. Ronald HUI Dictation 1 Example:3 x 4 Example:3 x 4 Three times Four Write the followings in words Write the followings in words 9. 11 x 12 9. 11 x 12 10. 22 – 16 10. 22 – 16 11. 33 + 44 11. 33 + 44 12. 52  13 12. 52  13 If you finish, please keep quiet! If you finish, please keep quiet!

8. Ronald HUI Revision Prime numbers ( 質數 ) Prime numbers ( 質數 ) 2, 3, 5, 7, 11, 13, 17, 19, 23, … 2, 3, 5, 7, 11, 13, 17, 19, 23, … Multiples ( 倍數 ) Multiples ( 倍數 ) Multiples of 2:2, 4, 6, 8, … Multiples of 2:2, 4, 6, 8, … Multiples of 3:3, 6, 9, 12, … Multiples of 3:3, 6, 9, 12, … Factors ( 因子 ) Factors ( 因子 ) 2 is a factor of 2, 4, 6, 8, … 2 is a factor of 2, 4, 6, 8, … 3 is a factor of 3, 6, 9, 12, … 3 is a factor of 3, 6, 9, 12, …

9. Multiplication Table Ronald HUI

10. Revision Find all factors of 18. Find all factors of 18. 18 = 1 x 18 18 = 1 x 18 18 = 2 x 9 18 = 2 x 9 18 = 3 x 6 18 = 3 x 6 18 = 6 x 3 18 = 6 x 3 18 = 9 x 2 18 = 9 x 2 18 = 18 x 1 18 = 18 x 1 Factors of 18: 1, 2, 3, 6, 9, 18 Factors of 18: 1, 2, 3, 6, 9, 18

11. Ronald HUI Mathematics nearby In US Open ( 美國網球公開賽 ), 64 players are in the first round, how many matches will be played to find out the champion? In US Open ( 美國網球公開賽 ), 64 players are in the first round, how many matches will be played to find out the champion? In English FA Cup ( 英國足總盃 ), 64 teams in the third round, how many matches will be played if there is no re-match ( 重賽 )? In English FA Cup ( 英國足總盃 ), 64 teams in the third round, how many matches will be played if there is no re-match ( 重賽 )?

12. Ronald HUI Mathematics nearby 64 players  32 matches 64 players  32 matches 32 players  16 matches 32 players  16 matches 16 players  8 matches 16 players  8 matches 8 players  4 matches 8 players  4 matches 4 players  2 matches 4 players  2 matches 2 players  1 match 2 players  1 match --------------- --------------- 63 matches 63 matches

13. Ronald HUI Mathematics nearby 64 players 64 players 1 winner 1 winner 63 losers 63 losers So, 63 matches! So, 63 matches! Lateral Thinking Lateral Thinking Edward de Bono Edward de Bono

14. Ronald HUI Mathematics nearby In the English Premier League ( 英國超級聯賽 ), there are 20 football teams. In the English Premier League ( 英國超級聯賽 ), there are 20 football teams. Each will play with every other in a home match ( 主場 ) and an away match ( 作客 ). Each will play with every other in a home match ( 主場 ) and an away match ( 作客 ). How many matches are there in the League every year? How many matches are there in the League every year?

15. Ronald HUI Good Luck! Enjoy the world of Mathematics!