Ronald Hui Tak Sun Secondary School Mathematics Ronald Hui Tak Sun Secondary School

Mathematics What have you learnt yesterday? What is your result in dictation? Ronald HUI

Dictation (Answers) 1. 1 + 2: 1 plus 2 2. 3 x 4: 3 times 4 3. 8  2: 8 is divided by 2 4. 9 – 5: 9 minus 5 Ronald HUI

Dictation (Answers) 5. Add 3 to 6 3 + 6 6. Subtract 4 from 3 3 – 4 7. Multiply 5 by 2 5 x 2 8. Divide 6 by 3 6  3 Ronald HUI

Dictation (Answers) 9. Addition 10. Subtraction 11. Multiplication 12. Division Ronald HUI

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

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

Addition (加法) 1 + 2 1 + 2 = 3 1 plus 2 Add 2 to 1 1 plus 2 is equal to 3. When we add 2 to 1, the answer is 3. The sum (和) of 1 and 2 is 3. Ronald HUI

Subtraction (減法) 4 – 3 4 – 3 = 1 4 minus 3 Subtract 3 from 4 4 minus 3 is equal to 1. When we subtract 3 from 4, the answer is 1. The difference (差) between 4 and 3 is 1. Ronald HUI

Multiplication (乘法) 5 x 6 5 x 6 = 30 5 times 6 Multiply 5 by 6 5 times 6 is equal to 30. When we multiply 5 by 6, the answer is 30. The product (積) of 5 and 6 is 30. Ronald HUI

Division (除法) 8  4 8 4 = 2 8 is divided by 4 / 8 over 4 Divide 8 by 4 8 4 = 2 8 over 4 is equal to 2. When we divide 8 by 4, the quotient (商) is 2. 8 is dividend (被除數), 4 is divisor (除數), no remainder (餘數) Ronald HUI

Commutative (互換) “+” and “x” are okay! “–” and “” are NOT okay! 1 + 2 = 2 + 1 5 x 6 = 6 x 5 “–” and “” are NOT okay! 4 – 3  3 – 4 8  4  4  8 Word order is important! Subtract 3 from 4, 8 is divided by 4 Ronald HUI

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

Time for Practice Page 5 of Textbook 1A Page 6 of Textbook 1A Class Practice Page 6 of Textbook 1A Exercise I Page 3 of Workbook 1A Exercise Ronald HUI

Numbers Numbers (Chapter 0.1, page 2) Natural Number (自然數) 1, 2, 3, 4, 5, … Whole Number (完整數) 0, 1, 2, 3, 4, 5, … Even Number (偶數，雙數) 0, 2, 4, 6, 8, … Odd Number (奇數，單數) 1, 3, 5, 7, 9, … Ronald HUI

Wikipedia 維基百科 http://zh.wikipedia.org/wiki/0 Ronald HUI

Time for Practice Page 5 of Textbook 1A Page 4 of Workbook 1A Exercise I Page 4 of Workbook 1A Exercise Ronald HUI

Mathematics Mathematics is an art! A + B = A x B 2 + 2 = 2 x 2 A + B + C = A x B x C 1 + 2 + 3 = 1 x 2 x 3 Ronald HUI

Mathematics Mathematics is an education! 2 x 2 = 5 !!! Mathematics lesson? Discipline (紀律)? Brainwash (洗腦)? Ronald HUI

Video of 2 + 2 = 5 Which is correct? Who do you want to be? 2 + 2 = 4 The student wrote the “correct” answer on the blackboard. The student wrote the “correct” answer on his notebook. Ronald HUI

Mathematics “我係方溫仔”! Wrong is right! We have to learn from the wrong thing to improve! You become a teacher! Ronald HUI

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

Reminder Summer Revision BCA Online Exercise Standard Homework (I) Deadline: 6 Sep (Thu), CTP BCA Online Exercise Password problems: 5 Sep (Wed), 4:15 pm, 6/F Computer rooms Deadline: 10 Sep (Mon) Standard Homework (I) Re-dictation (11 Sep) Ronald HUI

Mathematics nearby How many times did the minute-hand (分針) overlap (重疊) with the hour-hand (時針) of a clock in a day? 12:00, 1:06, 2:11, 3:17, 4:22, 5:27, 6:33, 7:38, 8:43, 9:49, 10:54 22 times! 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 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

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