1. Ronald Hui Tak Sun Secondary School
Mathematics
Ronald Hui
Tak Sun Secondary School

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

3. 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

4. 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

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

6. 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

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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. Wikipedia 維基百科
Ronald HUI

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

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

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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

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