MathematicsMathematics

Ronald HuiRonald Hui

Tak Sun Secondary SchoolTak Sun Secondary School

Ronald HUIRonald HUI

MathematicsMathematics

What have you learnt last week?What have you learnt last week? Have you handed in the Have you handed in the

following homework?following homework? Summer Revision P6 – S1Summer Revision P6 – S1

One missingOne missing Standard Homework (I)Standard Homework (I)

Two missingTwo missing

Ronald HUIRonald HUI

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

Ronald HUIRonald HUI

RevisionRevision

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

Ronald HUIRonald HUI

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 ))

Ronald HUIRonald HUI

Time for PracticeTime for Practice

Page 3 of Workbook 1APage 3 of Workbook 1A Exercise (Level 2)Exercise (Level 2) Questions 5 – 6Questions 5 – 6

Ronald HUIRonald HUI

Multiples (p.7)Multiples (p.7)

Multiples (Multiples ( 倍數倍數 )) Multiples of 2:Multiples of 2: 2, 4, 6, 8, …2, 4, 6, 8, … Multiples of 3:Multiples of 3: 3, 6, 9, 12, …3, 6, 9, 12, … Multiples of 4:Multiples of 4: 4, 8, 12, 16, …4, 8, 12, 16, … Multiples of 5:Multiples of 5: 5, 10, 15, 20, …5, 10, 15, 20, … Multiples of 6:Multiples of 6: 6, 12, 18, 24, …6, 12, 18, 24, …

What is the rule?What is the rule?

Ronald HUIRonald HUI

Multiples (p.7)Multiples (p.7)

How many multiples of 2 do we How many multiples of 2 do we have?have?

Is there any number having Is there any number having limited number of multiples?limited number of multiples?

Is 0 a multiple of 2?Is 0 a multiple of 2? Normally, multiples are used on Normally, multiples are used on

natural numbers onlynatural numbers only

Ronald HUIRonald HUI

Factors (p.8)Factors (p.8)

4 is a multiple of 24 is a multiple of 2 2 is a factor 2 is a factor (( 因子因子 ) of 4.) of 4.

FactorsFactors 2 is a factor of 2, 4, 6, 8, …2 is a factor of 2, 4, 6, 8, … 3 is a factor of 3, 6, 9, 12, …3 is a factor of 3, 6, 9, 12, … 4 is a factor of 4, 8, 12, 16, …4 is a factor of 4, 8, 12, 16, … 5 is a factor of 5, 10, 15, 20, …5 is a factor of 5, 10, 15, 20, …

What is the rule?What is the rule?

Ronald HUIRonald HUI

Factors (p.8)Factors (p.8)

Find all factors of 18.Find all factors of 18. 18 18 1 = 18 1 = 18 1 is a factor 1 is a factor 18 18 2 = 9 2 = 9 2 is a factor 2 is a factor 18 18 3 = 6 3 = 6 3 is a factor 3 is a factor 18 18 4 = ? 4 = ? 4 is NOT a factor 4 is NOT a factor 18 18 5 = ? 5 = ? 5 is NOT a factor 5 is NOT a factor 18 18 6 = 3 6 = 3 6 is a factor 6 is a factor 18 18 7 = ? 7 = ? 7 is NOT a factor 7 is NOT a factor

Ronald HUIRonald HUI

Factors (p.8)Factors (p.8)

Find all factors of 18.Find all factors of 18. 18 = 1 x 1818 = 1 x 18 18 = 2 x 918 = 2 x 9 18 = 3 x 618 = 3 x 6 18 = 6 x 318 = 6 x 3 18 = 9 x 218 = 9 x 2 18 = 18 x 118 = 18 x 1

Factors of 18: Factors of 18: 1, 2, 3, 6, 9, 181, 2, 3, 6, 9, 18

Ronald HUIRonald HUI

Factors (p.8)Factors (p.8)

Factors of 18: 1, 2, 3, 6, 9, 18Factors of 18: 1, 2, 3, 6, 9, 18 Any number is divisible by 1Any number is divisible by 1

1 is a factor of any number1 is a factor of any number Even numbers are divisible by 2Even numbers are divisible by 2

2 is a factor of any even number2 is a factor of any even number Any number is divisible by itselfAny number is divisible by itself

Any number is a factor of itselfAny number is a factor of itself

Ronald HUIRonald HUI

Prime Numbers (p.8)Prime Numbers (p.8)

Prime number (Prime number ( 質數質數 )) AA natural number (other than 1) natural number (other than 1)

which is NOT divisible by any which is NOT divisible by any number except 1 and itselfnumber except 1 and itself

Prime number:Prime number: 2, 3, 5, 7, 11, 13, 17, 19, 23, …2, 3, 5, 7, 11, 13, 17, 19, 23, …

Composite number (Composite number ( 合成數合成數 )) 4, 6, 8, 9, 10, 12, 14, 15, 16, …4, 6, 8, 9, 10, 12, 14, 15, 16, …

1 is not prime nor composite1 is not prime nor composite

Ronald HUIRonald HUI

ReminderReminder

BCA Online ExerciseBCA Online Exercise Deadline: 10 Sep (Mon)Deadline: 10 Sep (Mon)

Re-dictation (11 Sep)Re-dictation (11 Sep) Pages 2 – 3 of TextbookPages 2 – 3 of Textbook

Standard Homework (II)Standard Homework (II) Deadline: 14 Sep (Fri)Deadline: 14 Sep (Fri)

PowerPoint filesPowerPoint fileshttp://personal.tsss.edu.hk/roh

Ronald HUIRonald HUI

Good Luck!Good Luck!

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