Transcript Good Luck! Enjoy the world of Mathematics!

Mathematics
Ronald Hui
Tak Sun Secondary School
Mathematics
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What have you learnt
yesterday?
What is your result in dictation?
Ronald HUI
Dictation (Answers)
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1.
2.
3.
4.
1 + 2:
3 x 4:
8  2:
9 – 5:
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1 plus 2
3 times 4
8 is divided by 2
9 minus 5
Dictation (Answers)
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5.
6.
7.
8.
Add 3 to 6
Subtract 4 from 3
Multiply 5 by 2
Divide 6 by 3
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3+6
3–4
5x2
63
Dictation (Answers)
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9. Addition
10. Subtraction
11. Multiplication
12. Division
Ronald HUI
My Mathematics class
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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
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Arithmetic Operations
(Chapter 0.2, page 2 – 4)
“+” – Addition
 “–” – Subtraction
 “x” – Multiplication
 “” – Division
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Plus
Minus
Times
Is divided by
Addition (加法)
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1+2
1 plus 2
 Add 2 to 1
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1+2=3
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.
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Subtraction (減法)
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4–3
4 minus 3
 Subtract 3 from 4
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4–3=1
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.
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Ronald HUI
Multiplication (乘法)
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5x6
5 times 6
 Multiply 5 by 6
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5 x 6 = 30
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.
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Ronald HUI
Division (除法)
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84
8 is divided by 4 / 8 over 4
 Divide 8 by 4
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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)
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Ronald HUI
Commutative (互換)
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“+” and “x” are okay!
1+2=2+1
 5x6= 6x5
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“–” and “” are NOT okay!
4–33–4
 8 4 4 8
 Word order is important!
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Subtract 3 from 4, 8 is divided by 4
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Calculation order
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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)
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Ronald HUI
Time for Practice
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Page 5 of Textbook 1A
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Page 6 of Textbook 1A
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Class Practice
Exercise I
Page 3 of Workbook 1A
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Exercise
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Numbers
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Numbers (Chapter 0.1, page 2)
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Natural Number (自然數)
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Whole Number (完整數)
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0, 1, 2, 3, 4, 5, …
Even Number (偶數，雙數)
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1, 2, 3, 4, 5, …
0, 2, 4, 6, 8, …
Odd Number (奇數，單數)
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1, 3, 5, 7, 9, …
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Wikipedia 維基百科
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http://zh.wikipedia.org/wiki/0
Ronald HUI
Time for Practice
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Page 5 of Textbook 1A
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Exercise I
Page 4 of Workbook 1A
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Exercise
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Mathematics
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Mathematics is an art!
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A+B=AxB
2+2=2x2
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A+B+C=AxBxC
1+2+3=1x2x3
Ronald HUI
Mathematics
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Mathematics is an education!
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2 x 2 = 5 !!!
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Mathematics lesson?
Discipline (紀律)?
Brainwash (洗腦)?
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Ronald HUI
Video of 2 + 2 = 5
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Which is correct?
2+2=4
 2+ 2= 5
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Who do you want to be?
The student wrote the “correct”
answer on the blackboard.
 The student wrote the “correct”
answer on his notebook.
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Ronald HUI
Mathematics
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“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
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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
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Summer Revision
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Deadline: 6 Sep (Thu), CTP
BCA Online Exercise
Password problems: 5 Sep (Wed),
4:15 pm, 6/F Computer rooms
 Deadline: 10 Sep (Mon)
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Standard Homework (I)
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Deadline: 10 Sep (Mon)
Re-dictation (11 Sep)
Ronald HUI
Mathematics nearby
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How many times did the minutehand (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
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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?
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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
Good Luck!
Enjoy the world of
Mathematics!
Ronald HUI