Week 29 ILEARN MathSTAR Review

Which numbers are prime?

• 1

• 2

• 3

• 4

• 5

which numbers are not prime

• 16

• 17

• 18

• 19

• 20

What are the missing factors?

• 2 and 3

• 3 and 6

• 3 and 3

• 1 and 9

Find the prime factorization of 30

• 2² • 5 • 7

• 2 • 3²

• 2 • 3 • 7

• 2 • 3 • 5

Which is the prime factorization of 12 ? 

• 2 x 6
• 2 + 2 + 2 + 2 + 2 + 2 
• 2² x 3
• 1 x 2² x 3

3(2c - 5)

• 6c - 15
• 6c + 15
• 6c + 15
• -6c - 15

Fill in the blank:
2(x + 7) = 2x + __

• 7
• 14
• 7x
• 14x

Fill in the blank:
4(3x + __) = 12x + 16

• 4
• 16
• 4x
• 12

Add

 $9+\left(-16\right)=$  

• 25

• 7

• -7

• -25

Find the sum.
 $-4+\left(-2\right)=$   

• -6

• -2

• 2

• 6