Factors -multiples-and-primes

Monday 1 May 2023Factors, Multiples and Primes

KeywordsFactor, multiple, prime, product, multiply, divide

Lesson Objectives:

Developing students will be able to find factors and multiples of numbers.

Secure students will be able to identify prime numbers.

Excelling students will be able to know prime numbers up to 100.

StarterAnswer the following:

415 + 392

62 x 29 117 ÷ 3

653 - 328= 807

= 1798 = 39

= 325



Lesson Objectives:




Types of numbers



Lesson Objectives:






Lesson Objectives:




Multiples

A multiple is a number in another number’s times table.

For example, the first 5 multiples of 3 are

3, 6, 9, 12, 15



Lesson Objectives:




Multiples

Find the first 10 multiples of the following numbers:

a) 3b) 6c) 7d) 12e) 15

3, 6, 9, 12, 15, 18…6, 12, 18, 24, 30, 36…7, 14, 21, 28, 35, 42…12, 24, 36, 48, 60, 72…15, 30, 45, 60, 75, 90…



Lesson Objectives:




Factors

Factors are numbers that divide exactly into another number.

For example, factors of 12 are

121 x 122 x 63 x 4

= 1, 2, 3, 4, 6, 12



Lesson Objectives:




Factors

Find all the factors of the following numbers:

a) 24b) 15c) 54d) 36e) 17

1, 2, 3, 4, 6, 8, 12, 241, 3, 5, 151, 2, 3, 6, 9, 18, 27, 541, 2, 3, 4, 6, 9, 12, 18, 361, 17



Lesson Objectives:




Factors

Find all the factors of the numbers 1-201 12 1, 23 1, 34 1, 2, 45 1, 56 1, 2, 3, 67 1, 78 1, 2, 4, 89 1, 3, 910 1, 2, 5, 10

11 1, 1112 1, 2, 3, 4, 6, 1213 1, 1314 1, 2, 7, 1415 1, 3, 5, 1516 1, 2, 4, 8, 1617 1, 1718 1, 2, 3, 6, 9, 1819 1, 1920 1, 2, 4, 5, 10, 20



Lesson Objectives:




Prime numbers

Prime numbers have ONLY TWO FACTORS. Which of the following are prime numbers? 1 12 1, 23 1, 34 1, 2, 45 1, 56 1, 2, 3, 67 1, 78 1, 2, 4, 89 1, 3, 910 1, 2, 5, 10

11 1, 1112 1, 2, 3, 4, 6, 1213 1, 1314 1, 2, 7, 1415 1, 3, 5, 1516 1, 2, 4, 8, 1617 1, 1718 1, 2, 3, 6, 9, 1819 1, 1920 1, 2, 4, 5, 10, 20



Lesson Objectives:




Prime Numbers• Prime numbers - are those which have

only two factors: 1 and the number itself.

Q: What are the prime numbers up to 20?

A: They are… 2, 3, 5, 7, 11, 13, 17 and 19



Lesson Objectives:




Prime numbers

On your 1-100 grid, colour in all the prime numbers by looking at the factors of each number.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97



Lesson Objectives:





True or False?77 is a prime number

FALSE - 77 appears in the 7 and 11

times tables.



TRUE - 2 is the only even prime number – it is only divisible by 1 and itself


True or False?17 is NOT a prime

number

FALSE - 17 is a prime number as it is only divisible

by 1 and itself



TRUE - 37 is a prime number as it is only divisible by itself

and 1



number

TRUE - 57 is not a prime number as it is divisible by

1, 3, 19 and itself



number

TRUE - 1, 3, 9, 11, 33 and 99 are all factors of 99


Activity –From the number cloud write down…a) All the odd numbers (8)

b) All the even numbers (6)

c) All the prime numbers (3)

d) All the square numbers (3)

e) All the cube numbers (3)

f) All the triangular numbers (6)

g) All the multiples of 5 (3)

h) All the multiples of 9 (4)

i) All the factors of 72 (7)

15

8 2441

636

1027

1936

17

55

2

No calculators allowed.


a) All the odd numbers (8) …………

b) All the even numbers (6) ………..

c) All the prime numbers (3) ……...

d) All the square numbers (3) …....

e) All the cube numbers (3) ………..

f) All the triangular numbers (6) ..

g) All the multiples of 5 (3) ………..

h) All the multiples of 9 (4) ………..

i) All the factors of 72 (7) …………..

a) 1, 9, 15, 17, 27, 41, 55, 63

b) 2, 6, 8, 10, 24, 36

c) 2, 17, 41

d) 1, 9, 36

e) 1, 8, 27

f) 1, 6, 10, 15, 36, 55

g) 10, 15, 55

h) 9, 27, 36, 63

i) 1, 2, 6, 8, 9, 24, 36


4 or 16

21

10 or 15


12

14

16

Education

Factors -multiples-and-primes