1.1 Factors, multiples and primes

what are the first 5 prime numbers in ascending order?

• 2,3,4,5,11

• 1,2,3,5,11

• 2,3,5,7,11

• 2,3,11,7,5

Find the LCM of 12 and 16...

• 48

• 36

• 64

• 96

Find the HCF of 12 and 16...

• 2

• 4

• 6

• 8

Which of these numbers is not prime?

• 17

• 25

• 23

• 37

Prime factor of 45

(You can use the factor tree method 🎄)

• 3 x 3 x 4

• 3 x 2 x 5

• 3 x 3 x 5

Prime factor of 126

(You can use the factor tree method 🎄)

• 2 x 2 x 3 x 7

• 3 x 3 x 3 x 7

• 2 x 3 x 3 x 7

LCM (5 , 7 , 10)

• 70

• 10

• 60

What is the missing factor?

• 1

• 2

• 5

• 8

What are the missing factors?

• 2 and 3

• 3 and 6

• 3 and 3

• 1 and 9

What are the missing factors?

• 2 and 3

• 3 and 6

• 3 and 3

• 1 and 9