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

2. Mathematics Keep silence in the class No talking when I talk
What should be ready in the next lesson?
Textbook
Erasable Pens/Pencils
Notebook & folder
Ronald HUI

3. Multiples (p.0.9) Multiples (倍數) What is the rule?
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

4. Multiples (p.0.9) 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

5. Multiplication Table
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6. Factors (p.0.9) 4 is a multiple of 2  2 is a factor (因子) of 4.
What is the rule?
Ronald HUI

7. Factors (p.0.9) Find all factors of 18. 18  1 = 18  1 is a factor
18  4 = 4.5  4 is NOT a factor
18  5 = 3.6  5 is NOT a factor
18  6 = 3  6 is a factor
18  7 = 2…  7 is NOT a factor
Ronald HUI

8. Factors (p.0.9) 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

9. Factors (p.0.9) 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

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