Prime and Composite Numbers

Open Ended

Find all factors of 12

Open Ended

Find all factors of 7

Factors of 7: 1 and 7

​Factors of 12: 1, 2, 3, 4, 6, 12

​Wed, 22nd Sep, 2021

Lesson 5: Prime numbers

by Ms Moony

​- Objective:

• Prime numbers​

• Composite numbers

Open Ended

Give me a prime number

Multiple Choice

Which number is prime?

• 4

• 5

• 10

• 15

Multiple Choice

Which number is prime?

• 2

• 4

• 6

• 8

Open Ended

Give me a composite number

Multiple Choice

..... is a composite number

• 73

• 61

• 49

• 37

Multiple Choice

..... is not a composite number

• 14

• 15

• 16

• 17

Open Ended

List all composite numbers are less than 10

​Fun fact

​1 is not prime

​"Biggest prime number" is

​https://www.youtube.com/watch?v=iDMdivGdrO8

​Prime number trick:

• ​Pick any prime number > 3

• Square it

• ​Add 14

• ​Divide by 4 or 12

4. Sum up.

​Vocabulary:

• ​Prime number

• ​Composite number

• ​Prime factorization

​HW:

• ​W7 - Maths - Lesson 6 - Quiz

• ​W7 - Maths - Lesson 6 - Game

Multiple Choice

Which is NOT a prime number?

• 1

• 2

• 11

• 19

Multiple Choice

Write 16 in prime factor form

• 4x4

• 2x2x2x2

• 2x8

• 4x4x2x2x2x2

Multiple Choice

Which list has only composite numbers?

• 1, 3, 4

• 2, 4, 6

• 4, 6, 8

• 5, 6, 8