Mathematics

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Mathematics

• Ronald Hui
• Tak Sun Secondary School

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Mathematics

• What have you learnt last week?
• Have you handed in the following homework?
• Summer Revision P6 S1
• One missing
• Standard Homework (I)
• Two missing

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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

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Revision

• Arithmetic Operations(Chapter 0.2, p.2 4)
• Addition Plus
• Subtraction Minus
• x Multiplication Times
• ? Division Is divided by

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Calculation order

• Please follow the order
• Brackets ( ), , (?????)
• Multiplication / division first,then addition /
  subtraction(??????)
• From left to right(????)

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Time for Practice

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

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Multiples (p.7)

• Multiples (??)
• 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?

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Multiples (p.7)

• 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

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Factors (p.8)

• 4 is a multiple of 2? 2 is a factor (??) of 4.
• Factors
• 2 is a factor of 2, 4, 6, 8,
• 3 is a factor of 3, 6, 9, 12,
• 4 is a factor of 4, 8, 12, 16,
• 5 is a factor of 5, 10, 15, 20,
• What is the rule?

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Factors (p.8)

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

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Factors (p.8)

• 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

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Factors (p.8)

• 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

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Prime Numbers (p.8)

• Prime number (??)
• A natural number (other than 1) which is NOT
  divisible by any number except 1 and itself
• Prime number
• 2, 3, 5, 7, 11, 13, 17, 19, 23,
• Composite number (???)
• 4, 6, 8, 9, 10, 12, 14, 15, 16,
• 1 is not prime nor composite

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Reminder

• BCA Online Exercise
• Deadline 10 Sep (Mon)
• Re-dictation (11 Sep)
• Pages 2 3 of Textbook
• Standard Homework (II)
• Deadline 14 Sep (Fri)
• PowerPoint files
• http//personal.tsss.edu.hk/roh

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• Good Luck!
• Enjoy the world of Mathematics!