factors, prime numbers, prime factorisation

 Prime numbers have:

• Exactly 2 factors

• 2 pairs of factors

• More than 2 factors

• 1 factor

Tags

CCSS.4.OA.B.4

 Which number is NOT a factor of 10?

• 1

• 2

• 3

• 5

Tags

CCSS.4.OA.B.4

  

Which one is a prime number?

• 15

• 17

• 21

• 39

Tags

CCSS.4.OA.B.4

Which of the following numbers shows all of the factors of 12?

• 1,2,3,4,6,12

• 1,2,3,4,6,8,12

• 1,2,4,6,12

• 2,4,6,8,10,12

Tags

CCSS.4.OA.B.4

Which list has only prime numbers?

• 2, 3, 4, 5

• 1, 5, 7, 9

• 2, 3, 5, 7

• 2, 4, 6, 8

Tags

CCSS.4.OA.B.4

which number below is NOT prime?

• 2

• 3

• 7

• 9

Tags

CCSS.4.OA.B.4

I am a prime number between 30 and 40.  Which number could I be?

• 31

• 33

• 36

• 39

Tags

CCSS.4.OA.B.4

What are all of the factors of 15?

• 1,3,5,15

• 3,15

• 1,15

• 5,15

Tags

CCSS.4.OA.B.4

 

What are the factors of 19?

• 1

• 19

• 1, 19

• 0

Tags

CCSS.4.OA.B.4

 

Which is a factor pair of 22?

• 1 x 11

• 2 x 11

• 21 x 1

• 22 x 3

Tags

CCSS.4.OA.B.4