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

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?

• 7
• 9
• 2
• 3

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

• 5,15

• 1,15

• 1,5

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