#1.Prime numbers

1. 1. Which of the following is not a prime number?

• 11

• 17

• 14

• 23

Tags

CCSS.4.OA.B.4

2) Which of the following is an odd composite number?

• 6

• 22

• 31

• 45

Tags

CCSS.4.OA.B.4

The number n = 2×3×5×7+5

• is a prime number.

• is divisible by 5.

• is an even number.

• is not a prime number.

Tags

CCSS.4.OA.B.4

What number is the only even prime number?

Tags

CCSS.4.OA.B.4

What are the prime factors of the number 60?

• 2

• 3

• 4

• 5

• 10

20 is a composite number. Why?

• Because it has more than two factors.

• Because its only factors are only 1 and itself.

Tags

CCSS.4.OA.B.4

_______________ have more than two factors.

• Factor tree

• Fractions

• Composite numbers

• Prime numbers

Tags

CCSS.4.OA.B.4

Which is the prime factorization of 42?

• 2 x 2 x 5 x 5

• 2 x 11 x 13

• 2 x 3 x 7

• 2 x 5 x 7

The PIN number for a mobile phone is made up of two 2-digit prime numbers. What could the number be?

• 1739 (17 - 39)

• 1931 (19 - 31)

• 1387 (13 - 87)

• 1199 (11 - 99)

Tags

CCSS.4.OA.C.5

The numbers that have only two factors and are different from each other are called

• odd numbers

• prime numbers

• composite numbers

• even numbers

Tags

CCSS.4.OA.B.4