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Mathematics

Mathematics. Ronald Hui Tak Sun Secondary School. Mathematics. What have you visited here? http://personal.tsss.edu.hk/roh Have you started your homework? Standard Homework (II) Deadline: 14 Sep (Wed) Are you ready for Dictation?. Revision. Arithmetic Operations “+” – Addition

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Mathematics

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  1. Mathematics Ronald Hui Tak Sun Secondary School

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

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

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

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

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

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

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

  9. Multiplication Table Ronald HUI

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

  11. 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 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)? Ronald HUI

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

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

  14. Mathematics nearby • 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). • How many matches are there in the League every year? Ronald HUI

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

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