mathematics ronald hui tak sun secondary school. ronald hui mathematics what have you learnt...

MathematicsMathematics

Ronald HuiRonald Hui

Tak Sun Secondary SchoolTak Sun Secondary School

Ronald HUIRonald HUI


What have you learnt What have you learnt yesterday?yesterday?

What is your result in dictation?What is your result in dictation?


Dictation (Answers)Dictation (Answers)

1.1. 1 + 2:1 + 2: 1 plus 21 plus 2 2.2. 3 x 4:3 x 4: 3 times 43 times 4 3.3. 8 8 2: 2: 8 is divided by 28 is divided by 2 4.4. 9 – 5:9 – 5: 9 minus 59 minus 5



5.5. Add 3 to 6Add 3 to 6 3 + 63 + 6 6.6. Subtract 4 from 3Subtract 4 from 3 3 – 43 – 4 7.7. Multiply 5 by 2Multiply 5 by 2 5 x 25 x 2 8.8. Divide 6 by 3Divide 6 by 3 6 6 3 3



9. Addition9. Addition 10. Subtraction10. Subtraction 11. Multiplication11. Multiplication 12. Division12. Division


My Mathematics classMy Mathematics class

Keep silence in the classKeep silence in the class No talking when I talkNo talking when I talk Make your only notesMake your only notes Deadline is deadlineDeadline is deadline Late homework Late homework detention detention Do corrections!Do corrections! Re-test / Re-dictationRe-test / Re-dictation


RevisionRevision

Arithmetic OperationsArithmetic Operations(Chapter 0.2, page 2 – 4)(Chapter 0.2, page 2 – 4) ““+” – Addition+” – Addition Plus Plus “–” – “–” – SubtractionSubtraction Minus Minus ““x” – Multiplicationx” – Multiplication Times Times ““” – ” – DivisionDivision Is divided by Is divided by


Addition (Addition ( 加法加法 ))

1 + 21 + 2 1 plus 21 plus 2 Add 2 to 1Add 2 to 1

1 + 2 = 31 + 2 = 3 1 plus 2 is equal to 3.1 plus 2 is equal to 3. When we add 2 to 1, the answer is When we add 2 to 1, the answer is

3.3. The sum (The sum ( 和和 ) of 1 and 2 is 3.) of 1 and 2 is 3.


Subtraction (Subtraction ( 減法減法 ))

4 – 34 – 3 4 minus 34 minus 3 Subtract 3 from 4Subtract 3 from 4

4 – 3 = 14 – 3 = 1 4 minus 3 is equal to 1.4 minus 3 is equal to 1. When we subtract 3 from 4, the When we subtract 3 from 4, the

answer is 1.answer is 1. The difference (The difference ( 差差 ) between 4 ) between 4

and 3 is 1.and 3 is 1.


Multiplication (Multiplication ( 乘法乘法 ))

5 x 65 x 6 5 times 65 times 6 Multiply 5 by 6Multiply 5 by 6

5 x 6 = 305 x 6 = 30 5 times 6 is equal to 30.5 times 6 is equal to 30. When we multiply 5 by 6, the When we multiply 5 by 6, the

answer is 30.answer is 30. The product (The product ( 積積 ) of 5 and 6 is 30.) of 5 and 6 is 30.


Division (Division ( 除法除法 ))

8 8 4 4 8 is divided by 4 / 8 over 48 is divided by 4 / 8 over 4 Divide 8 by 4Divide 8 by 4

88 4 = 2 4 = 2 8 over 4 is equal to 2.8 over 4 is equal to 2. When we divide 8 by 4, the When we divide 8 by 4, the

quotient (quotient ( 商商 ) is 2.) is 2. 8 is dividend (8 is dividend ( 被除數被除數 ), 4 is divisor), 4 is divisor

((除數除數 ),), no remainderno remainder ((餘數餘數 ))


Commutative (Commutative ( 互換互換 ))

““+”+” and “x” are okay!and “x” are okay! 1 + 2 = 2 + 11 + 2 = 2 + 1 5 x 6 = 6 x 55 x 6 = 6 x 5

“–”“–” and “and “” are NOT okay!” are NOT okay! 4 – 3 4 – 3 3 – 4 3 – 4 8 8 4 4 4 4 8 8 Word order is important!Word order is important!

Subtract 3 from 4, 8 is divided by 4Subtract 3 from 4, 8 is divided by 4


Calculation orderCalculation order

Please follow the order:Please follow the order: Brackets ( ), [ ], { }Brackets ( ), [ ], { }

((小中大括號小中大括號 )) Multiplication / division first,Multiplication / division first,

then addition / subtractionthen addition / subtraction((先乘除後加減先乘除後加減 ))

From left to rightFrom left to right((由左至右由左至右 ))


Time for PracticeTime for Practice

Page 5 of Textbook 1APage 5 of Textbook 1A Class PracticeClass Practice

Page 6 of Textbook 1APage 6 of Textbook 1A Exercise IExercise I

Page 3 of Workbook 1APage 3 of Workbook 1A ExerciseExercise


NumbersNumbers

Numbers (Chapter 0.1, page 2)Numbers (Chapter 0.1, page 2) Natural Number (Natural Number ( 自然數自然數 ))

1, 2, 3, 4, 5, …1, 2, 3, 4, 5, … Whole Number (Whole Number ( 完整數完整數 ))

0,0, 1,1, 2,2, 3,3, 4,4, 5,5, …… Even Number (Even Number ( 偶數，雙數偶數，雙數 ))

0, 2, 4, 6, 8, …0, 2, 4, 6, 8, … Odd Number (Odd Number ( 奇數，單數奇數，單數 ))

1, 3, 5, 7, 9, …1, 3, 5, 7, 9, …

Wikipedia Wikipedia 維基百科維基百科

http://zh.wikipedia.org/wiki/0



Time for PracticeTime for Practice

Page 5 of Textbook 1APage 5 of Textbook 1A Exercise IExercise I

Page 4 of Workbook 1APage 4 of Workbook 1A ExerciseExercise



Mathematics is an art!Mathematics is an art!

A + B = A x BA + B = A x B 2 + 2 = 2 x 22 + 2 = 2 x 2

A + B + C = A x B x CA + B + C = A x B x C 1 + 2 + 3 = 1 x 2 x 31 + 2 + 3 = 1 x 2 x 3



Mathematics is an education!Mathematics is an education!

2 x 2 = 52 x 2 = 5 !!!!!!

Mathematics lesson?Mathematics lesson? Discipline (Discipline ( 紀律紀律 )?)? Brainwash (Brainwash ( 洗腦洗腦 )?)?


Video of 2 + 2 = 5Video of 2 + 2 = 5

Which is correct?Which is correct? 2 + 2 = 42 + 2 = 4 2 + 2 = 52 + 2 = 5

Who do you want to be?Who do you want to be? The student wrote the “correct” The student wrote the “correct”

answer on the blackboard.answer on the blackboard. The student wrote the “correct” The student wrote the “correct”

answer on his notebook.answer on his notebook.



““我係方溫仔我係方溫仔”” !! Wrong is right!Wrong is right! We have to learn from the We have to learn from the

wrong thing to improve!wrong thing to improve! You become a teacher!You become a teacher!


My Mathematics classMy Mathematics class

Keep silence in the classKeep silence in the class No talking when I talkNo talking when I talk Make your only notesMake your only notes Deadline is deadlineDeadline is deadline Late homework Late homework detention detention Do corrections!Do corrections! Re-test / Re-dictationRe-test / Re-dictation


ReminderReminder

Summer RevisionSummer Revision Deadline: 6 Sep (Thu), CTPDeadline: 6 Sep (Thu), CTP

BCA Online ExerciseBCA Online Exercise Password problems: 5 Sep (Wed), Password problems: 5 Sep (Wed),

4:15 pm, 6/F Computer rooms4:15 pm, 6/F Computer rooms Deadline: 10 Sep (Mon)Deadline: 10 Sep (Mon)

Standard Homework (I)Standard Homework (I) Deadline: 10 Sep (Mon)Deadline: 10 Sep (Mon)

Re-dictation (11 Sep)Re-dictation (11 Sep)


Mathematics nearbyMathematics nearby

How many times did the minute-How many times did the minute-hand (hand ( 分針分針 ) overlap) overlap (( 重疊重疊 ) ) with the hour-handwith the hour-hand (( 時針時針 ) of a ) of a clock in a day?clock in a day?

12:00,12:00, 1:06,1:06, 2:11,2:11, 3:17,3:17, 4:22,4:22, 5:27,5:27, 6:33,6:33, 7:38,7:38, 8:43,8:43, 9:49,9:49, 10:5410:54

2222 times!times!


Mathematics nearbyMathematics nearby

In US Open (In US Open (美國網球公開賽美國網球公開賽 ), ), 64 players are in the first round, 64 players are in the first round, how many matches will be how many matches will be played to find out the champion?played to find out the champion?

In English FA CupIn English FA Cup ((英國足總盃英國足總盃 ), ), 64 teams in the third round, how 64 teams in the third round, how many matches will be played if many matches will be played if there is no re-matchthere is no re-match ((重賽重賽 )?)?


Good Luck!Good Luck!

Enjoy the world of Enjoy the world of Mathematics!Mathematics!

mathematics ronald hui tak sun secondary school. ronald hui mathematics what have you learnt...

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