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Mathematics Ronald Hui Tak Sun Secondary School
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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?
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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
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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 )
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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
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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.
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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!
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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, …
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Multiplication Table Ronald HUI
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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
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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 )?
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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
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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
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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?
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Ronald HUI Good Luck! Enjoy the world of Mathematics!
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