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Mathematics

Mathematics. Ronald Hui Tak Sun Secondary School. Mathematics. What have you learnt last week? Have you handed in the following homework? Summer Revision P6 – S1 One missing Standard Homework (I) Two missing. My Mathematics class. Keep silence in the class No talking when I talk

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Mathematics

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  1. Mathematics Ronald Hui Tak Sun Secondary School

  2. Mathematics • What have you learnt last week? • Have you handed in the following homework? • Summer Revision P6 – S1 • One missing • Standard Homework (I) • Two missing Ronald HUI

  3. My Mathematics class • Keep silence in the class • No talking when I talk • Make your only notes • Deadline is deadline • Late homework  detention • Do corrections! • Re-test / Re-dictation Ronald HUI

  4. Revision • Arithmetic Operations(Chapter 0.2, p.2 – 4) • “+” – Addition Plus • “–” – Subtraction Minus • “x” – Multiplication Times • “” – Division Is divided by Ronald HUI

  5. Calculation order • Please follow the order: • Brackets ( ), [ ], { }(小中大括號) • Multiplication / division first,then addition / subtraction(先乘除後加減) • From left to right(由左至右) Ronald HUI

  6. Time for Practice • Page 3 of Workbook 1A • Exercise (Level 2) • Questions 5 – 6 Ronald HUI

  7. Multiples (p.7) • Multiples (倍數) • Multiples of 2: 2, 4, 6, 8, … • Multiples of 3: 3, 6, 9, 12, … • Multiples of 4: 4, 8, 12, 16, … • Multiples of 5: 5, 10, 15, 20, … • Multiples of 6: 6, 12, 18, 24, … • What is the rule? Ronald HUI

  8. Multiples (p.7) • How many multiples of 2 do we have? • Is there any number having limited number of multiples? • Is 0 a multiple of 2? • Normally, multiples are used on natural numbers only Ronald HUI

  9. Factors (p.8) • 4 is a multiple of 2 2 is a factor(因子) of 4. • Factors • 2 is a factor of 2, 4, 6, 8, … • 3 is a factor of 3, 6, 9, 12, … • 4 is a factor of 4, 8, 12, 16, … • 5 is a factor of 5, 10, 15, 20, … • What is the rule? Ronald HUI

  10. Factors (p.8) • Find all factors of 18. • 18  1 = 18  1 is a factor • 18  2 = 9  2 is a factor • 18  3 = 6  3 is a factor • 18  4 = ?  4 is NOT a factor • 18  5 = ?  5 is NOT a factor • 18  6 = 3  6 is a factor • 18  7 = ?  7 is NOT a factor Ronald HUI

  11. Factors (p.8) • 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

  12. Factors (p.8) • Factors of 18: 1, 2, 3, 6, 9, 18 • Any number is divisible by 1 • 1 is a factor of any number • Even numbers are divisible by 2 • 2 is a factor of any even number • Any number is divisible by itself • Any number is a factor of itself Ronald HUI

  13. Prime Numbers (p.8) • Prime number (質數) • Anatural number (other than 1) which is NOT divisible by any number except 1 and itself • Prime number: • 2, 3, 5, 7, 11, 13, 17, 19, 23, … • Composite number (合成數) • 4, 6, 8, 9, 10, 12, 14, 15, 16, … • 1 is not prime nor composite Ronald HUI

  14. Reminder • BCA Online Exercise • Deadline: 10 Sep (Mon) • Re-dictation (11 Sep) • Pages 2 – 3 of Textbook • Standard Homework (II) • Deadline: 14 Sep (Fri) • PowerPoint files • http://personal.tsss.edu.hk/roh Ronald HUI

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

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