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4D Primes, Composite numbers

Good morning!
Schedule: 
  • Learning goals
  • What did we do wednesday
  • Prime and composite numbers 
  • Prime factorization
  • Worksheet
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Slide 1: Diapositive
WiskundeMiddelbare schoolvwoLeerjaar 4

Cette leçon contient 16 diapositives, avec quiz interactifs et diapositives de texte.

Éléments de cette leçon

Good morning!
Schedule: 
  • Learning goals
  • What did we do wednesday
  • Prime and composite numbers 
  • Prime factorization
  • Worksheet

Slide 1 - Diapositive

Learning goals 
At the end of this lessons I can:
  • Define a numbers as a prime or a composite number
  • Find the prime factorization of any (whole) number

Slide 2 - Diapositive

What did we do last time?

Slide 3 - Carte mentale

What is HCF(13, 5)?

Slide 4 - Question ouverte

4D: Primes and composite numbers
HCF(13, 5) = 1 
because 13 and 5 are both Prime numbers 

Factors of 13: 

Factors of 5: 

Slide 5 - Diapositive

4D: Primes and composite numbers
A prime number is a natural number with only 2 factors
Ex.  The factors of 7 are 1 and 7

Slide 6 - Diapositive

4D: Primes and composite numbers
A prime number is a natural number with only 2 factors
A composite number is a natural number with more than 2 factors
Ex.  The factors of 7 are 1 and 7
Ex.  The factors of 10 are 1, 10, 2, 5

Slide 7 - Diapositive

4D: Prime factorization
Every Composite number can be written as the product of prime numbers factors

6 = 2 ⋅ 3

15 = 3 ⋅ 5


Slide 8 - Diapositive

4D: Prime factorization
With larger numbers we can use 2 strategies: 
Repeated division

or 

Factor tree

Slide 9 - Diapositive

Repeated division

180
Factor tree 

180
Write along!

Slide 10 - Diapositive

4D: Prime factorization
Repeated division or Factor tree? 

Use what works best for you!!

Slide 11 - Diapositive

Homework
          Worksheet (ask for answer sheet)
4D            2, 6efgh, 7behk, 8

                                      MyiMaths
Finished your homework?

Slide 12 - Diapositive

4D: Primes and composite numbers
Step 1: Is 1 a prime number? 

Slide 13 - Diapositive

4D: Primes and composite numbers
Step 1: Is 1 a prime number? 
Step 2: Is the next number a prime number? 
Yes            Circle it
No             Cross it off


Slide 14 - Diapositive

4D: Primes and composite numbers
Step 1: Is 1 a prime number? 
Step 2: Is the next number a prime number? 
Yes            Circle it
No             Cross it off
Step 3: Cross off any number that is divisible by the number from step 2



Slide 15 - Diapositive

4D: Primes and composite numbers
Step 1: Is 1 a prime number? 
Step 2: Is the next number a prime number? 
Yes            Circle it
No             Cross it off
Step 3: Cross off any number that is divisible by the number from step 2
Step 4: Repeat step 2 and 3



Slide 16 - Diapositive

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