Unit 3 Review (OA4, OA5)

Which number is prime?

• 4

• 5

• 9

• 20

Marcus plants some trees in equal rows of 4. Which THREE answers could be the number of trees Marcus planted? (Select THREE)

• 10

• 24

• 32

• 15

• 16

Which number below is composite?

• 7

• 17

• 27

• 37

Which number has the MOST factors?

• 20

• 12

• 24

• 18

Which numbers below have 3 as a factor? Select THREE correct answers. (Select THREE).

• 12

• 14

• 27

• 42

• 52

Joseph notices that certain pairs of prime numbers use the same digits, but are written in reverse order. For example: 13 and 31. Which pair of numbers below do NOT follow this rule?

• 17 and 71

• 37 and 73

• 14 and 41

• 79 and 97

What is the greatest 2-digit prime number?

• 99

• 98

• 97

• 96

How many numbers between 1 and 50 are PRIME?

• 15

• 16

• 17

• 13

Choose Yes or No to tell whether the given pattern follows the corresponding rule:

Rule: Add 6

Pattern: 24, 30, 36, 48, 54

• Yes

• No

Choose Yes or No to tell whether the given pattern follows the corresponding rule:

Rule: Every other number is odd

Pattern: 5, 8, 11, 14, 17

• Yes

• No